1. Helium liquefaction by Gifford-McMahon cycle cryogenic refrigerator;Yoshimura;Rev. Scient. Instr.,1989
2. Helium liquefaction by a Gifford-McMahon cycle Cryocooler;Nagao;Adv. Cryog. Engr.,1990
3. High efficient two-stage GM refrigerator with magnetic material in the liquid helium temperature range;Kuriyama;Adv. Cryog. Engr.,1990
4. Recent progress on rare earth magnetic regenerator materials;Hashimoto;Adv. Cryog. Engr.,1992
5. Effect of high entropy magnetic regenerator materials on power of the GM refrigerator;Hashimoto;Adv. Cryog. Engr.,1994