1. Brunger AP. The magnitude, variability and angular characteristics of the shortwave sky radiance. PhD thesis, Toronto University, Mechanical Engineering Department, Toronto, Canada, 1987.
2. An automatic all sky scanning radiometer;Coombes;Can. J. Physics,1982
3. Chandrasekhar S. Radiative transfer. New York: Dover Publications Inc., 1960.
4. Kourganoff V. Basic methods in transfer problems. New York: Dover Publications Inc., 1963.
5. Goody RM. Atmospheric radiation, vol. I. London: Oxford University Press, 1964.