A. J. Symonds, Ph.D. thesis, University of Sussex, 1965.
D. F. Brewer, A. J. Symonds, and A. L. Thomson,Phys. Rev. Letters 15, 182 (1965).
D. F. Brewer,J. Low Temp. Phys. 3, 205 (1970).
C. G. Kuper,Physica 24, 1009 (1956).
L. S. Reut and I. Z. Fisher,Soviet Phys.—JETP 33, 981 (1971).
S. L. Chan,Can. J. Phys., to be published.
K. R. Atkins,Phys. Rev. 113, 962 (1959).
C. W. F. Everitt, K. R. Atkins, and A. Denenstein,Phys. Rev. 136, A1494 (1964).
L. D. Landau and E. M. Lifshitz,Fluid Mechanics (Pergamon Press, London, 1963), p. 240.
F. D. M. Pobell, H. W. Chan, L. R. Corruccini, R. P. Henkel, S. W. Schwenterly, and J. D. Reppy,Phys. Rev. Letters 28, 542 (1972).
K. R. Atkins and Y. Narahara,Phys. Rev. 138, A437 (1965).
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K. R. Atkins and I. Rudnick,Progress of Low Temperature Physics, C. J. Gorter, ed. (North-Holland, Amsterdam, 1970), Vol. 6, Chap. II.
See, for example, R. P. Feynman,Physica 24, 518 (1958).
L. T. Sun, M.Sc. thesis, University of Sussex, 1969 (unpublished).