1. L. D. Landau andI. Pomerančuk:Dokl. Akad. Nauk USSR,59, 669 (1948).
2. J. G. Daunt, R. E. Probst, H. L. Johnston, L. T. Aldrich andA. O. Nier:Phys. Rev.,72, 502 (1947).
3. C. T. Lane, H. A. Fairbank, L. T. Aldrich andA. O. Nier:Phys. Rev.,73, 256 (1948).
4. J. J. M. Beenakker andK. W. Taconis:Progress in Low Temperature Physics (Amsterdam, 1955), chap. VI.
5. The best evidence concerning this check seems to be in the analysis of second sound in dilute solutions of3He; however the ideality of these mixtures had to be assumed and the effective mass of3He obtained in this way is a temperature dependent quantity: see, for instance,K. R. Atkins:Liquid Helium (Cambridge, 1959), p. 284.