A comprehensive empirical and theoretical literature survey of Islamic bonds (sukuk)

References

• Abdullah, M. S., and J. S. Keshminder. in press. “What Drives Green Sukuk? A Leader’s Perspective.” Journal of Sustainable Finance & Investment, 1–21. doi:10.1080/20430795.2020.1821339.
   Web of Science ®Google Scholar
• Ahmed, H., and A. H. Elsayed. 2019. “Are Islamic and Conventional Capital Markets Decoupled? Evidence from Stock and Bonds/Sukuk Markets in Malaysia.” The Quarterly Review of Economics and Finance 74: 56–66.
   Web of Science ®Google Scholar
• Ahmed, H., M. K. Hassan, and B. Rayfield. 2018. “When and Why Firms Issue Sukuk?” Managerial Finance 44 (6): 774–786. doi:10.1108/MF-06-2017-0207.
   Web of Science ®Google Scholar
• Ahmed, E. R., M. A. Islam, and K. H. K. Ariffin. 2015. “An Empirical Analysis on Legitimacy of Sukuk: An Insight of Malaysian Sukuk.” Asian Social Science 11 (13): 84–97.
   Google Scholar
• Ahroum, R., and B. Achchab. 2017. “Pricing of Sukuk Musharakah with Joint Venture as Underlying, Beyond the use of PLS Ratio.” Journal of Islamic Accounting and Business Research 8 (4): 406–419.
   Web of Science ®Google Scholar
• Al Fathan, R., and T. Arundina. 2019. “Finance-growth Nexus: Islamic Finance Development in Indonesia.” International Journal of Islamic and Middle Eastern Finance and Management 12 (5): 698–711. doi:10.1108/IMEFM-09-2018-0285.
   Web of Science ®Google Scholar
• Al-Deehani, T., R. A. A. Karim, and V. Murinde. 1999. “The Capital Structure of Islamic Banks Under the Contractual Obligation of Profit Sharing.” International Journal of Theoretical and Applied Finance 2 (3): 243–283.
   Google Scholar
• Alam, N., M. Bhatti, and J. T. F. Wong. 2018. “Assessing Sukuk Defaults Using Value-at-Risk Techniques.” Managerial Finance 44 (6): 665–687. doi:10.1108/MF-05-2018-0218.
   Web of Science ®Google Scholar
• Aloui, C., S. Hammoudeh, and H. B. Hamida. 2015a. “Price Discovery and Regime Shift Behavior in the Relationship Between Sharia Stocks and Sukuk: A Two-State Markov Switching Analysis.” Pacific-Basin Finance Journal 34: 121–135.
   Web of Science ®Google Scholar
• Aloui, C., S. Hammoudeh, and H. B. Hamida. 2015b. “Co-movement Between Sharia Stocks and Sukuk in the GCC Markets: A Time-Frequency Analysis.” Journal of International Financial Markets, Institutions and Money 34: 69–79.
   Web of Science ®Google Scholar
• Aloui, C., S. Hammoudeh, and H. B. Hamida. 2015c. “Global Factors Driving Structural Changes in the Co-movement Between Sharia Stocks and Sukuk in the Gulf Cooperation Council Countries.” The North American Journal of Economics and Finance 31: 311–329.
   Web of Science ®Google Scholar
• Alswaidan, M. W., A. Daynes, and P. Pasgas. 2017. “Understanding and Evaluation of Risk in Sukuk Structures.” Journal of Islamic Accounting and Business Research 8 (4): 389–405.
   Web of Science ®Google Scholar
• Arundina, T., M. A. Omar, and M. Kartiwi. 2015. “The Predictive Accuracy of Sukuk Ratings; Multinomial Logistic and Neural Network Inferences.” Pacific-Basin Finance Journal 34: 273–292.
   Web of Science ®Google Scholar
• Asutay, M., and A. Hakim. 2017. “Exploring International Economic Integration Through Sukuk Market Connectivity: A Network Perspective.” Research in International Business and Finance 46: 77–94.
   Web of Science ®Google Scholar
• Ayturk, Y., M. Asutay, and E. Aksak. 2017. “What Explains Corporate Sukuk Primary Market Spreads?” Research in International Business and Finance 40: 141–149.
   Web of Science ®Google Scholar
• Azhgaliyeva, D., A. Kapoor, and Y. Liu. 2020. “Green Bonds for Financing Renewable Energy and Energy Efficiency in South-East Asia: A Review of Policies.” Journal of Sustainable Finance & Investment 10 (2): 113–140.
   Web of Science ®Google Scholar
• Azmat, S., M. Skully, and K. Brown. 2017. “The (Little) Difference That Makes All the Difference Between Islamic and Conventional Bonds.” Pacific-Basin Finance Journal 42: 46–59.
   Web of Science ®Google Scholar
• Balcilar, M., G. Cerci, and R. Demirer. 2016. “Is There a Role for Islamic Bonds in Global Diversification Strategies?” Managerial Finance 42 (7): 656–679.
   Web of Science ®Google Scholar
• Ben Jedidia Khoutem, D. 2014. “Islamic Banks-Sukuk Markets Relationships and Economic Development: The Case of the Tunisian Post-revolution Economy.” Journal of Islamic Accounting and Business Research 5 (1): 47–60.
   Google Scholar
• Bhuiyan, R. A., M. P. Rahman, B. Saiti, and G. M. Ghani. 2018. “Financial Integration Between Sukuk and Bond Indices of Emerging Markets: Insights from Wavelet Coherence and Multivariate-GARCH Analysis.” Borsa Istanbul Review 18 (3): 218–230.
   Web of Science ®Google Scholar
• Bhuiyan, R. A., M. P. Rahman, B. Saiti, and G. B. M. Ghani. 2019a. “Does the Malaysian Sovereign Sukuk Market Offer Portfolio Diversification Opportunities for Global Fixed-Income Investors? Evidence from Wavelet Coherence and Multivariate-GARCH Analyses.” The North American Journal of Economics and Finance 47: 675–687.
   Web of Science ®Google Scholar
• Bhuiyan, R. A., M. P. Rahman, B. Saiti, and G. Mat Ghani. 2019b. “Co-movement Dynamics Between Global Sukuk and Bond Markets: New Insights from a Wavelet Analysis.” International Journal of Emerging Markets 14 (4): 550–581. doi:10.1108/IJOEM-12-2017-0521.
   Web of Science ®Google Scholar
• Blume, M. E., F. Lim, and A. C. MacKinlay. 1998. “The Declining Credit Quality of US Corporate Debt: Myth or Reality?” The Journal of Finance 53 (4): 1389–1413.
   Web of Science ®Google Scholar
• Bo, D., E. R. A. E. Ali, and B. Saiti. 2016. “Sukuk Issuance in China: Trends and Positive Expectations.” International Review of Management and Marketing 6 (4): 1020–1025.
   Google Scholar
• Duqi, A., and H. Al-Tamimi. 2019. “Factors Affecting Investors’ Decision Regarding Investment in Islamic Sukuk.” Qualitative Research in Financial Markets 11 (1): 60–72. doi:10.1108/QRFM-01-2018-0009.
   Web of Science ®Google Scholar
• Durrani, A., M. Rosmin, and U. Volz. 2020. “The Role of Central Banks in Scaling up Sustainable Finance–What do Monetary Authorities in the Asia-Pacific Region Think?” Journal of Sustainable Finance & Investment 10 (2): 92–112.
   Web of Science ®Google Scholar
• Dusuki, A. W. 2010. “Do Equity-Based Sukuk Structures in Islamic Capital Markets Manifest the Objectives of Shariah?” Journal of Financial Services Marketing 15 (3): 203–214.
   Google Scholar
• El-Khatib, R. 2017. “Determinants of Corporate Leverage in Publicly Listed GCC Companies – Conventional Versus Sukuk.” In Global Corporate Governance. Vol. 19 of Advances in Financial Economics, edited by Kose John, Anil K. Makhija, and Stephen P. Ferris, 77–102. Bingley: Emerald Publishing Limited.
   Google Scholar
• Fauzi, F., D. Foo, and A. Basyith. 2017. “Islamic Bond Announcement: Is There Any Effect on Returns?” Global Business Review 18 (2): 327–347.
   Web of Science ®Google Scholar
• Fenech, J. P., and J. Watson. 2009. “The use of Fixed Income in Emerging Markets: Empirical Evidence.” Banks and Bank Systems 4 (1): 11–18.
   Google Scholar
• Gabbi, G., and A. Sironi. 2005. “Which Factors Affect Corporate Bonds Pricing? Empirical Evidence from Eurobonds Primary Market Spreads.” The European Journal of Finance 11 (1): 59–74.
   Google Scholar
• Godlewski, C. J., R. Turk-Ariss, and L. Weill. 2013. “Sukuk vs. Conventional Bonds: A Stock Market Perspective.” Journal of Comparative Economics 41 (3): 745–761.
   Web of Science ®Google Scholar
• Godlewski, C. J., R. Turk-Ariss, and L. Weill. 2016. “Do the Type of Sukuk and Choice of Shariah Scholar Matter?” Journal of Economic Behavior & Organization 132: 63–76.
   Web of Science ®Google Scholar
• Grassa, R., and H. Miniaoui. 2018. “Corporate Choice Between Conventional Bond and Sukuk Issuance Evidence from GCC Countries.” Research in International Business and Finance 45: 454–466.
   Web of Science ®Google Scholar
• Guild, J. 2020. “The Political and Institutional Constraints on Green Finance in Indonesia.” Journal of Sustainable Finance & Investment 10 (2): 157–170.
   Web of Science ®Google Scholar
• Halim, Z. A., J. How, and P. Verhoeven. 2017. “Agency Costs and Corporate Sukuk Issuance.” Pacific-Basin Finance Journal 42: 83–95.
   Web of Science ®Google Scholar
• Halim, A. H. A., and M. Zahraa. 2014. “Sukuk Ijarah: To What Extent They Comply or Contradict the Ijarah Contract and Bay’ ‘Inah?” Pertanika Journal of Social Sciences & Humanities 22 (1): 283–292.
   Google Scholar
• Hanefah, M. M., A. Noguchi, and M. Muda. 2013. “Sukuk: Global Issues and Challenges.” Journal of Legal, Ethical and Regulatory Issues 16 (1): 107–119.
   Google Scholar
• Hanif, M. 2016. “Economic Substance or Legal Form: An Evaluation of Islamic Finance Practice.” International Journal of Islamic and Middle Eastern Finance and Management 9 (2): 277–295.
   Web of Science ®Google Scholar
• Hanim Kamil, K., M. Abdullah, S. Shahimi, and A. Ghafar Ismail. 2010. “The Subprime Mortgages Crisis and Islamic Securitization.” International Journal of Islamic and Middle Eastern Finance and Management 3 (4): 386–401.
   Google Scholar
• Haque, M. M., M. A. F. Chowdhury, A. A. Buriev, O. I. Bacha, and M. Masih. 2018. “Who Drives Whom-Sukuk or Bond? A New Evidence from Granger Causality and Wavelet Approach.” Review of Financial Economics 36 (2): 117–132.
   Web of Science ®Google Scholar
• Hassan, M. K., A. Paltrinieri, A. Dreassi, S. Miani, and A. Sclip. 2018. “The Determinants of Co-movement Dynamics Between Sukuk and Conventional Bonds.” The Quarterly Review of Economics and Finance 68: 73–84.
   Web of Science ®Google Scholar
• Hussain, T., and M. N. Khalil. 2019. “Shariah Issues in Islamic Capital Markets of Pakistan: A Case Study of Sukuk.” Journal of Islamic Thought and Civilization 9 (1): 1–22.
   Google Scholar
• Ibrahim, M. H. 2015. “Issues in Islamic Banking and Finance: Islamic Banks, Shariah-Compliant Investment and Sukuk.” Pacific-Basin Finance Journal 34: 185–191.
   Web of Science ®Google Scholar
• Ibrahim, Y., and M. S. Minai. 2009. “Islamic Bonds and the Wealth Effects: Evidence from Malaysia.” Investment Management and Financial Innovations 6 (1): 184–191.
   Google Scholar
• Iqbal, Z. 2015. “The Appeal of Sukuk as Asset-Backed Financing.” JKAU: Islamic Econ 28 (2): 177–187. doi:10.4197/Islec.28-2.6.
   Google Scholar
• Ismath Bacha, O., and A. Mirakhor. 2018. “Funding Development Infrastructure Without Leverage: A Risk-Sharing Alternative Using Innovative Sukuk Structures.” The World Economy 41 (3): 752–762.
   Web of Science ®Google Scholar
• Issoufou, C., and U. A. Oseni. 2015. “The Application of Third Party Guarantee in Structuring Sukuk in the Islamic Capital Market: A Preliminary Literature Survey.” Mediterranean Journal of Social Sciences 6 (5): 130–138.
   Google Scholar
• Jamilah Abdul Jalil, M., and Z. Abdul Rahman. 2012. “Sukuk Investment: Comparison of the Profits Obtained by Using Ijarah and Musharakah Mutanaqisah Principles with Long-Term Tenure.” Qualitative Research in Financial Markets 4 (2/3): 206–227.
   Google Scholar
• Jobst, A. A. 2009. “Islamic Securitisation: An Ethical Remedy to Incentive Problems?” International Journal of Monetary Economics and Finance 2 (3–4): 348–365.
   Google Scholar
• Jobst, A., P. Kunzel, P. Mills, and A. Sy. 2008. “Islamic Bond Issuance: What Sovereign Debt Managers Need to Know.” International Journal of Islamic and Middle Eastern Finance and Management 1 (4): 330–344.
   Google Scholar
• Kamali, M. 2009. “A Shari’ah Analysis of Issues in Islamic Leasing.” Journal of King Abdulaziz University, Islamic Economics 22 (2): 41–79.
   Google Scholar
• Klein, P. O., and L. Weill. 2016. “Why Do Companies Issue Sukuk?” Review of Financial Economics 31: 26–33.
   Web of Science ®Google Scholar
• Maghyereh, A. I., H. Abdoh, and B. Awartani. 2019. “Connectedness and Hedging Between Gold and Islamic Securities: A New Evidence from Time-Frequency Domain Approaches.” Pacific-Basin Finance Journal 54: 13–28.
   Web of Science ®Google Scholar
• Maghyereh, A. I., and B. Awartani. 2016. “Dynamic Transmissions Between Sukuk and Bond Markets.” Research in International Business and Finance 38: 246–261.
   Web of Science ®Google Scholar
• Maurer, B. 2010. “Form Versus Substance: AAOIFI Projects and Islamic Fundamentals in the Case of Sukuk.” Journal of Islamic Accounting and Business Research 1 (1): 32–41.
   Google Scholar
• Mimouni, K., H. Smaoui, and A. Temimi. 2019. “The Impact of Sukuk on the Performance of Conventional and Islamic Banks.” Pacific-Basin Finance Journal 54: 42–54.
   Web of Science ®Google Scholar
• Mnif, E., B. Salhi, and A. Jarboui. 2019. “Herding Behaviour and Islamic Market Efficiency Assessment: Case of Dow Jones and Sukuk Market.” International Journal of Islamic and Middle Eastern Finance and Management 13 (1): 24–41. doi:10.1108/IMEFM-10-2018-0354.
   Web of Science ®Google Scholar
• Mohamed, H. H., M. Masih, and O. I. Bacha. 2015. “Why do Issuers Issue Sukuk or Conventional Bond? Evidence from Malaysian Listed Firms Using Partial Adjustment Models.” Pacific-Basin Finance Journal 34: 233–252.
   Web of Science ®Google Scholar
• Mohamed Naim, A., M. Yazid Isa, and M. Liki Hamid. 2013. “The Effects of new AAOIFI Standards on Sukuk in Choosing the Most Authentic Islamic Principles.” Journal of Islamic Accounting and Business Research 4 (1): 77–93.
   Google Scholar
• Mohd Noor, A., M. N. Haron, and S. Z. Mohammad. 2015. “The Application of Tanazul and its Shariah Issues in Equity Based Sukuk.” Al-Shajarah, 87–110.
   Web of Science ®Google Scholar
• Nagano, M. 2016. “Who Issues Sukuk and When?: An Analysis of the Determinants of Islamic Bond Issuance.” Review of Financial Economics 31 (1): 45–55.
   Google Scholar
• Nagano, M. 2017. “Sukuk Issuance and Information Asymmetry: Why Do Firms Issue Sukuk?” Pacific-Basin Finance Journal 42: 142–157.
   Web of Science ®Google Scholar
• Naifar, N. 2016. “Modeling Dependence Structure Between Stock Market Volatility and Sukuk Yields: A Nonlinear Study in the Case of Saudi Arabia.” Borsa Istanbul Review 16 (3): 157–166.
   Web of Science ®Google Scholar
• Naifar, N., and S. Hammoudeh. 2016. “Do Global Financial Distress and Uncertainties Impact GCC and Global Sukuk Return Dynamics?” Pacific-Basin Finance Journal 39: 57–69.
   Web of Science ®Google Scholar
• Naifar, N., S. Hammoudeh, and M. S. Al dohaiman. 2016. “Dependence Structure Between Sukuk (Islamic Bonds) and Stock Market Conditions: An Empirical Analysis with Archimedean Copulas.” Journal of International Financial Markets, Institutions and Money 44: 148–165.
   Web of Science ®Google Scholar
• Naifar, N., M. Mroua, and S. Bahloul. 2017. “Do Regional and Global Uncertainty Factors Affect Differently the Conventional Bonds and Sukuk? New Evidence.” Pacific-Basin Finance Journal 41: 65–74.
   Web of Science ®Google Scholar
• Naifar, N., and S. Mseddi. 2013. “Sukuk Spreads Determinants and Pricing Model Methodology.” Afro-Asian Journal of Finance and Accounting 3 (3): 241–257.
   Google Scholar
• Najeeb, S. F., O. Bacha, and M. Masih. 2017. “Does a Held-to-Maturity Strategy Impede Effective Portfolio Diversification for Islamic Bond (Sukuk) Portfolios? A Multi-scale Continuous Wavelet Correlation Analysis.” Emerging Markets Finance and Trade 53 (10): 2377–2393.
   Web of Science ®Google Scholar
• Nasir, A., and U. Farooq. 2017. “Analysis of Value at Risk of Sukuk and Conventional Bonds in Pakistan.” Journal of Islamic Accounting and Business Research 8 (4): 375–388.
   Web of Science ®Google Scholar
• Nienhaus, V., and A. Karatas. 2016. “Market Perceptions of Liquid Sovereign Sukuk: A New Asset Class?” International Journal of Islamic and Middle Eastern Finance and Management 9 (1): 87–108.
   Web of Science ®Google Scholar
• Nik Abdul Ghani, N. A. R. 2018. “Beneficial Ownership in Sukuk Ijarah: A Shariah Appraisal.” International Journal of Islamic and Middle Eastern Finance and Management 11 (1): 2–17. doi:10.1108/IMEFM-02-2017-0026.
   Web of Science ®Google Scholar
• Oseni, A. U. 2014. “Dispute Management in Islamic Financial Institutions: A Case Study of Near Sukuk Defaults.” Journal of International Trade Law and Policy 13 (3): 198–214.
   Google Scholar
• Oseni, U. A., A. U. F. Ahmad, and M. K. Hassan. 2016. “The Legal Implications of ‘Fatwā Shopping’ in the Islamic Finance Industry: Problems, Perceptions and Prospects.” Arab Law Quarterly 30 (2): 107–137.
   Web of Science ®Google Scholar
• Oseni, U. A., and M. K. Hassan. 2015. “Regulating the Governing Law Clauses in Sukuk Transactions.” Journal of Banking Regulation 16 (3): 220–249.
   Web of Science ®Google Scholar
• Radzi, R. M., and M. K. Lewis. 2015. “Religion and the Clash of “Ideals” and “Realities” in Business: The Case of Islamic Bonds (Sukuk).” Thunderbird International Business Review 57 (4): 295–310.
   Web of Science ®Google Scholar
• Rafay, A., R. Sadiq, and M. Ajmal. 2017. “Uniform Framework for Sukuk al-Ijarah–a Proposed Model for All Madhahib.” Journal of Islamic Accounting and Business Research 8 (4): 420–454.
   Web of Science ®Google Scholar
• Razak, S. S., B. Saiti, and Y. Dinç. 2019. “The Contracts, Structures and Pricing Mechanisms of Sukuk: A Critical Assessment.” Borsa Istanbul Review 19: S21–S33.
   Web of Science ®Google Scholar
• Reboredo, J. C., and N. Naifar. 2017. “Do Islamic Bond (Sukuk) Prices Reflect Financial and Policy Uncertainty? A Quantile Regression Approach.” Emerging Markets Finance and Trade 53 (7): 1535–1546.
   Web of Science ®Google Scholar
• Rohim, M., and S. M. Saniff. 2013. “Analysis on the Thoughts of Imam Abu Hanifah and Imam Syafi’i on the Ijtihad Method for Sukuk Instrument.” Sains Humanika 62 (1): 17–24.
   Google Scholar
• Rusgianto, S., and N. Ahmad. 2013. “Volatility Behavior of Sukuk Market: An Empirical Analysis of the Dow Jones Citigroup Sukuk Index.” Middle East Journal of Scientific Research 13 (1): 93–97.
   Google Scholar
• Saad, N. M., M. N. Haniff, and N. Ali. 2016. “Corporate Governance and Default Risk in Long-Term Conventional Bonds and Sukuk in Malaysia.” International Journal of Applied Business and Economic Research 14 (6): 3709–3723.
   Google Scholar
• Safari, M., and M. Ariff. 2013. “Do Debt Markets Price Sukuk and Conventional Bonds Differently?” Journal of King Abdulaziz University: Islamic Economics 362 (3249): 1–37.
   Google Scholar
• Sairally, B. S., M. Muhammad, and M. M. Mustafa. 2016. “Additional Tier 1 Capital Instruments Under Basel III: A Shariah Viewpoint.” Arab Law Quarterly 30 (2): 138–162.
   Web of Science ®Google Scholar
• Saripudin, K. N., S. Mohamad, N. F. M. Razif, S. J. Rosli, and B. Ahmad. 2012. “Application of Promise in Sukuk Musharakah Structure.” Middle-East Journal of Scientific Research 12 (2): 160–167.
   Google Scholar
• Sclip, A., A. Dreassi, S. Miani, and A. Paltrinieri. 2016. “Dynamic Correlations and Volatility Linkages Between Stocks and Sukuk: Evidence from International Markets.” Review of Financial Economics 31: 34–44.
   Web of Science ®Google Scholar
• Sherif, M., and C. T. Erkol. 2017. “Sukuk and Conventional Bonds: Shareholder Wealth Perspective.” Journal of Islamic Accounting and Business Research 8 (4): 347–374.
   Web of Science ®Google Scholar
• Sidek, N. Z. M., and N. Ahmad. 2016. “Social Capital in Islamic Finance: The Case of Sukuk.” International Business Management 10: 4670–4678.
   Google Scholar
• Siswantoro, D. 2012. “Is “not-Real” Price Lawful? The Case of Islamic (Sukuk) Mutual Funds in Indonesia During Financial Crisis.” Journal of Islamic Accounting and Business Research 3 (2): 163–177.
   Google Scholar
• Smaoui, H., and M. Khawaja. 2017. “The Determinants of Sukuk Market Development.” Emerging Markets Finance and Trade 53 (7): 1501–1518.
   Web of Science ®Google Scholar
• Smaoui, H., and S. Nechi. 2017. “Does Sukuk Market Development Spur Economic Growth?” Research in International Business and Finance 41: 136–147.
   Web of Science ®Google Scholar
• Solé, J. 2008. “Prospects and Challenges for Developing Corporate Sukuk and Bond Markets International Monetary Fund. Lessons from a Kuwait Case Study.” International Journal of Islamic and Middle Eastern Finance and Management 1 (1): 20–30.
   Google Scholar
• Syed Azman, S. M. M., and E. R. A. E. Ali. 2016. “Potential Role of Social Impact Bond and Socially Responsible Investment Sukuk as Financial Tools That Can Help Address Issues of Poverty and Socio-Economic Insecurity.” Intellectual Discourse 24: 343–364.
   Web of Science ®Google Scholar
• Tariq, A. A., and H. Dar. 2007. “Risks of Sukuk Structures: Implications for Resource Mobilization.” Thunderbird International Business Review 49 (2): 203–223.
   Google Scholar
• Ulusoy, A., and M. Ela. 2017. “Lack of Standardization in Sukuk Market.” Journal of Islamic Economics, Banking and Finance 13 (1): 147–169.
   Google Scholar
• Warsame, M. H., and E. M. Ireri. 2016. “Does the Theory of Planned Behaviour (TPB) Matter in Sukuk Investment Decisions?” Journal of Behavioral and Experimental Finance 12: 93–100.
   Web of Science ®Google Scholar
• Wilson, R. 2008. “Innovation in the Structuring of Islamic Sukuk Securities.” Humanomics 24 (3): 170–181.
   Google Scholar