1. A design procedure for solar heating systems;Klein;Solar Energy,1976
2. An averaging technique for predicting the performance of a solar energy collector system;Stickford,1976
3. W. A. Beckman, S. A. Klein and J. A. Duffie, Solar Heating Design by the f-chart Method. Wiley-Interscience, New York.
4. Minimum cost sizing of solar heating systems;Ward,1976
5. Optimal sizing of solar collectors by the method of relative areas;Dennis Barley;Solar Energy,1978