1. T. Ohtsuka, Refrigeration problems for applications, in: “Proc. of the JSJS III”, (1989), p.6
2. S. J. Williamson et al, Application of SQUID detectors in biomagnetism, NBS Special Publication 508, (1978), p.177
3. D. S. Buchanan et al, Development of a hybrid Gifford-McMahon Joule-Thomson based NEUROMAGNETOMETER “CRYOSQUID“, in: “Proc. of the Fifth International Cryocoolers Conference”, (1988), p.35
4. Y. M. Kang et al, 4K GM/JT cryocooler for cryogenic sensors, in: “Proc. of the Sixth International Cryocoolers Conference”, (1990), p. 17
5. R. C. Longsworth, 4K Gifford-McMahon/Joule-Thomson cycle refrigerators, in: “Advances in Cryogenic Engineering,” Vol.33, Plenum Press, New York (1988), p.689