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2. Granryd, E., Palm, B.: Refrigerating engineering, Stockholm Royal Institute of Technology (2005), see Chap. 4-3
3. Einstein, A., Szilard, L.: US Patent 1781541, Refrigeration Filed Dec 16 1927 Patented Nov 11, 1930 United States Patent Office
4. Micallef, D., Micallef C.: Mathematical model of vapour absorption refrigeration unit (2010)
5. Raghuvanshi, S., Maheshwari, G.: Analysis of ammonia–water (NH3-H2O) vapor absorption refrigeration system based on first law of thermodynamics, August (2011)