1. The interrelationship and characteristics distribution of direct, diffuse and total solar radiation;Liu;Solar Energy,1960
2. Dependence on turbidity and cloudiness of the distribution of the monthly average hourly diffuse, global and direct radiation;Soler;Solar Wind Technol.,1987
3. Variations horaries et distributions de frequences des composants du rayonment solaire et des temperatures de l'air et du sol nû a Uccle en fonction de la fraction journaliére d'insolation;Dogniaux,1977