1. See e.g. Aranoff, S., Percus, J.K.: Phys. Rev.162, 878 (1967)
2. Kijewski, L.J., Percus, J.K.: Phys. Rev.164, 228 (1967)
3. See e.g. Percus, J.K.: In: Statistical mechanics, ed. Rice, S., Freed, K., Light, J., p. 337, University of Chicago Press 1972
4. See e.g. Garrod, C., Percus, J.K.: J. Math. Phys.5, 1756 (1964)
5. Percus, J.K.: Reduced density matrices. Courant Institute Lecture Notes 1969 (unpublished)