1. Inhibition of evaporation
2. Principles of refrigeration;Warren,1979
3. Evaporative cooler using a porous material to be used for reservation of food
4. Principles of refrigeration;Dossat,1981
5. Gram, Parry, Phyner, Schaffner, Stulz, Wehrli. Report on Fibre concrete roofing by Swiss Center for Appropriate Technology (SKAT) and Intermediate Technology Energy Development Group (ITD G); 1986