1. Solar Engineering of thermal processes;Duffie,1991
2. Measurements on the accuracy of pyranometers;Nast;Solar Energy,1983
3. A probability density model for hourly total and beam irradiance on arbitrarily oriented planes;Olseth;Solar Energy,1987
4. Active solar collectors and their applications;Rabl,1985
5. A. M. Robinson, Personal communication, Department of Electrical Engineering, University of Edmonton, Canada (1991).