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2. Private communication with R.G. Ross, Jr.
3. Little, W.A., Microminiature Refrigeration, Rev. Sci. Instrum., vol. 55, no. 5 (1984), pp. 661–680.
4. Inframetics, Inc., 16 Esquire Road, North Billeric, MA 01862-2598, U.S.
5. Walker, G. and Bingham, R., Micro and nanno cryocoolers: speculation on future development, 6th Int. Cryocooler Conf. (1990), pp. 363–37