1. M. D. Girardeau, in: “Recent Progress in Many-Body Theories,” J. G. Zabolitzky, M. de Llano, M. Fortes, and J. W. Clark, eds., Lecture Notes in Physics Vol. 142, Springer-Verlag, Berlin (1981) pp. 355ff.
2. M. D. Girardeau, Bull. Am. Phys. Soc. 28:782 (1983).
3. C. F. Hart and M. D. Girardeau, Phys. Rev. Lett. 51:1725 (1983).
4. G. Gamow, Z. Phys. 51:204 (1928).
5. A. J. F. Siegert, Phys. Rev. 56: 750 (1939).