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3. Solar Energy Thermal Process;Duffie,1991
4. ASHRAE Standard 93–1986, Methods of testing to determine the thermal performance of solar collectors. Standard ANSI/ASHRAE 93-86. The American Society of Heating, Refrigerating and Air-Conditioning Engineers, Atlanta, Ga.
5. Guide lines and directions for determining the usability of solar collectors, a solar collector efficiency test. Bundescerband Solarenergie (BSE),1978