1. Pat. U.S. 1 275 507 “Method and apparatus for inducing heat change”. R. Vuilleumier, USA, ACC. 13 August 1918
2. “Cryocoolers Part 1 Fundamentals”;Walker,1983
3. M. Nykyi et al., “Evaluation of the Vuilleumier Heat Pump for Heating Applicaions”, Technical Research Center of Finland, Research Report 15/1981, 37P
4. H.D. Kuhl et al., “Computer Simulation of A Vuilleumier Cycle Heat Pump for Domestic Use”, Proc. 12th IECEC, 869125, 1986
5. Masahiro Sakai, etc., “Research of the Vuilleumier Cycle Heat Pump”, Energy Resources Research Circle, Speech Reports at the 8th Research Public Meeting, 1–3, 1989, 14P