1. E. F. Yendall, in: Advances in Cryogenic Engineering, Vol. 2, Plenum Press, New York (1960) p. 188.
2. F. F. Chellis and W. H. Hogan, in: Advances in Cryogenic Engineering, Vol. 9, Plenum Press, New York (1964), p. 545.
3. R. White and W. J. Uhl Jr., “Vuilleumier Heat Driven Cryogenic Refrigerator,” Air Force Flight Dynamics Laboratory, WPAPB, Ohio (Jan. 1967).
4. F. T. Turner and W. H. Hogan, J. Vac. Sci. Tech., 3(5):252 (1966).
5. E. B. Qvale and J. L. Smith Jr., ASMS Trans. Series A, J. Eng. Power, 90(1):45 (1968).