1. A liquid-nitrogen-operated refrigerator for temperature below 77K;Chellis;Adv Cryog Eng,1964
2. Zhou Y. Test of a Vuilleumier refrigerator with power being supplied by liquid nitrogen. In: Proceedings of 10th international cryogenic engineering conference, vol. 16; 1984. p. 121–4.
3. Matsubara Y, Kaneko M. Vuilleumier cycle cryocooler operating below 8K. In: 3rd Cryocooler conference, vol. 1; 1985. p. 234–9.
4. A novel refrigerator attaining temperature below λ point;Zhou;Sci China-Phys Mech Astron,2012
5. Helium liquefaction by a Gifford–McMahon cycle cryogenic refrigerator;Yoshimura;Rev Sci Instrum,1989