References
- Ångström, A. 1961. Techniques of determining the turbidity of the atmosphere. Tellus 13, 214–223.
- Ångström, A. and Rodhe, B. 1966. Pyrheliometric measurements with special regard to the circumsolar sky radiation. Tellus 18, 25–33.
- Choudhury, B. 1981. NASA Technical Memo. 82135, May 1981.
- Drummond, A. J. 1956. On the measurement of sky radiation. Arch. Meteorol. Geophys. Bioklim. B.7. 413–436.
- Hoyt, D. V. 1978. A model for the calculation of solar global radiation. Sol. Energy 21, 27–35.
- Hoyt, D. V. 1979. Hourly solar radiation—surface meteorological observations SOLMET: vol. 2—final report, Department of Energy, U.S.A., pp. 119–163.
- Mani, A., Chacko, O. and Hariharan, S. 1969. A study of Ångström turbidity parameters from solar radiation measurements in India. Tellus 21, 829–843.
- Mani, A. and Chacko, O. 1980. Attenuation of solar radiation in the atmosphere. Sol. Energy 24. 347–349.
- Mani, A. and Rangarajan, S. 1982. Solar radiation over India, Allied Publishers, New Delhi.
- Volz, F., 1961. Photometer mit selen photoelement. Arch. Meteorol. Geophys. Bioklim. IOB, 100–131.