1. R. Schiavilla, V.R. Pandharipande and R.B. Wiringa, Nucl. Phys. A449, 219 (1986)
2. J. Carlson, Phys. Rev. C36, 2026 (1987)
3. J. Carlson, Phys. Rev. C38, 1879 (1988)
4. J. Carlson and M.H. Kalos, Phys. Rev. C32, 2105 (1985)
5. Steven C. Pieper, R.B. Wiringa and V.R. Pandharipande, Phys. Rev. Lett. 64, 364 (1990)