1. USDA Forest Service Res. Paper PNW-142;J. Buffo,1972
2. Fritschen, L. J. and Hsia, J.: 1979, ?Estimation of Hourly Direct Beam and Diffuse Solar Radiation from Global Solar Radiation Measurements?, Proceedings Solar 79 Northwest, August 10?19, 1979, Pacific Northwest Solar Energy Association, Seattle, Washington, pp. 193?194.
3. Fritschen, L. J., Gay, L. W., and Simpson, J. R.: 1983, ?The Effect of a Moisture Step Change and Advective Conditions on the Energy Balance Components of Irrigated Alfalfa?, Extended Abstracts. 16th Conference on Agric. and Forest Meteor., April 26?28, 1983, Amer. Meteorol. Soc., Ft. Collins, Colorado, pp. 83?86.
4. Fritschen, L. J. and Simpson, J. R.: 1989, ?Surface Energy and Radiation Balance Systems: General Description and Improvements?, J. Applied Meteorol. 28, 680?689.
5. World Meteorol. Organization, Technical Note;K. Ya. Kondratyev,1977