1. Chen GM, He YJ, Wang Q. An absorption refrigerator at low temperatures. Chin. Invent. Pat., 2003: CN03115631.2 (Issued, September 2004).
2. Chen GM. An absorption refrigeration device for deep-freezing. Chin. Invent. Pat., 2002:CN02110940.0 (Issued, March 2004).
3. Erickson DC. LPG recovery from reformer treat gas. 2000: US6158241 (US patent).
4. Refinery waste heat powered absorption refrigeration – cycle specification and design;Erickson,1998
5. Study on the lowest refrigeration temperature of an absorption refrigeration cycle;He;J. Eng. Thermophys.,2004