1. H. H. Jensen, H. Smith, and P. Wolfle, J. Low Temp. Phys. 51, 81 (1983).
2. Alexander Fetter, Quantum Statistics and the Many Body Problem S. B. Trickey, W. Kirk, and J. Dufty; eds. (Plenum Press, New York, 1975), p. 127.
3. H. N. Scholz, Ph. D. thesis, Ohio State University, (1982), unpublished.
4. H. Kojima and E. Ebisawa, in Proceedings of LT-17 (North-Holland, Amsterdam, 1984), p. 999.
5. K. Ichikawa, S. Yamasaki, H. Akimoto, T. Kodama, T. Shigi, and H. Kojima, Phys. Rev. Lett. 58, 1949 (1987).