1. Performance of flat-plate energy collectors;Hottel,1954
2. Cost of house heating with solar energy;Löf;Solar Energy,1973
3. On the optimum tilt of a solar collector;Kern;Solar Energy,1975
4. Operating experience with solar water heating;Hyewood;Journal of the Institution of Heating and Ventilation Engineers,1971
5. Utilization of sun and sky radiation for heating cooling of buildings;Yellott;ASHRAE Journal,1973