1. The interrelationship and characteristic distribution of direct, diffuse and total solar radiation;Liu;Solar Energy,1960
2. The estimation of monthly mean values of daily total shortwave radiation on vertical and inclined surfaces from sunshine records for latitudes 40°N–40°S;Page,1961
3. Estimation of monthly average of the diffuse component of total insolation on a horizontal surface;Iqbal;Solar Energy,1978
4. Daily insolation on surface titled towards equator;Liu;Transactions ASHRAE,1962
5. Calculation of monthly average insolation on tilted surface;Klien;Solar Energy,1977