1. Daily insolation on surfaces tilted toward the equator;Liu;Trans. ASHRAE,1962
2. The estimation of monthly mean values of daily total short-wave radiation on vertical and inclined surfaces from sunshine records for latitudes 40°N-40°S;Page,1961
3. Standard values for the solar constant and its spectral components;Thekaekara;Nat. Phys. Sci.,1971
4. The interrelationship and characteristic distribution of direct, diffuse, and total solar radiation;Liu;Solar Energy,1960
5. Solar radiation at New Delhi;Choudhury;Solar Energy,1963