1. Monthly maps of mean daily insolation for the United States;Bennett;Solar Energy,1965
2. Solar thermal conversion mission analysis;Randall,1974
3. Direct Solar Radiation Available on Clear Days;Threlkeld;ASHRAE Trans,1958
4. The interrelationship and characteristic distribution of direct, diffuse and total solar radiation;Liu;Solar Energy,1969
5. ASHRAE Handbook of Fundamentals,1974