1. V. R. Pandharipande and D. G. Ravenhall, In Proc. of Les Houches Winter School 1989, Ed. M. Soyeur, Plenum press.
2. R. B. Wiringa, V. Fiks and A. Fabrocini, Phys. Rev. C38, 1010 (1988).
3. R. A. Aziz, et al., J. Chem. Phys. 70, 4330 (1979).
4. M. H. Kalos, et al., Phys. Rev. B24, 115 (1981)
5. I.E. Lagaris and V. R. Pandharipande, Nucl. Phys. A359, 331 (1981).