1. “System Design in Solar Water Heaters with Natural Circulation”;Gupta;Solar Energy,1968
2. “An Improved Computer Program for the Thermal Performance of a Solar Water Heater”;Ong;solar Energy,1976
3. Kamal, W.A. “System Design of Thermosyphonic solar water Heaters”. Proceedings of Energex 82, international Energy Conference, Canada, August 1982, pp 995–1000.
4. “Experiments with a Flat Plate Solar Water Heating System in Thermosyphonic Flow”;Shitzer;Solar Energy,1979
5. “A Technical note on Testing of Collectors”;Doron;Solar Energy,1967