References
- A.V. Kelarev, S.J. Quinn, Directed graphs and combinatorial properties of semigroups, J. Algebra 251 (1) (2002) 16–26.
- I. Chakrabarty, S. Ghosh, M.K. Sen, Undirected power graphs of semigroups. Semigroup Forum 2009 Jun 1 (Vol. 78, No. 3, pp. 410-426). Springer-Verlag.
- J. Abawajy, A. Kelarev, M. Chowdhury, Power graphs: A survey, Electron. J. Graph Theory Appl. 1 (2) (2013) 125–147.
- D. Cvetković, S.K. Simić, Towards a spectral theory of graphs based on the signless Laplacian, I, Publ. Inst. Math. 85 (99) (2009) 19–33.
- D. Cvetković, S.K. Simić, Towards a spectral theory of graphs based on the signless Laplacian, II, Linear Algebra Appl. 432 (9) (2010) 2257–2272.
- D. Cvetković, S.K. Simić, Towards a spectral theory of graphs based on the signless Laplacian, III, Appl. Anal. Discrete Math. 15 (2010) 6–166.
- R.A. Horn, R.A. Horn, C.R. Johnson, Matrix Analysis, Cambridge university press, 1990.
- K. Hoffman, R. Kunze, Linear Algebra, Englewood Cliffs, New Jersey, 1971.
- R.B. Bapat, Graphs and Matrices, Vol. 27, Springer, New York, 2010.
- C. Godsil, G. Royle, Algebraic Graph Theory, Vol. 207, Springer Science & Business Media, New York, 2013.
- A.E. Brouwer, W.H. Haemers, Spectra of Graphs, Springer Science & Business Media, 2011.
- D.M. Cvetkovic, M. Doob, I. Gutman, A. Torgašev, Recent Results in the Theory of Graph Spectra (Vol. 36), Elsevier, 1988.