1. L. P. Horwitz and R. Faibish, Anal. de Fisica, Monografias, M. A. del Olmo, M. Santander, and J. Mateas Guilarte, eds., in Group Theoretical Methods in Physics, Proceedings of the XIX Intl. Colloquium, Salamanca, Spain, 1992, Vol II, (CIEMAT, Real Sociedad Espanola de Fisica, Madrid); L. P. Horwitz, J. Math. Phys. 34, 645 (1993).
2. See, e. g., H. Goldstein, Classical Mechanics (Addison-Wesley, Reading, Mass., 2nd ed. 1980 ), Chapter 3.
3. The construction of this two-body potential from the Newtonian-strength limit of general relativity is discussed by J. L. Cook, Aust. J. Phys. 25, 117 (1972). See Appendix B.
4. M. A. Trump and W. C. Schieve, Found. Phys. 28, 1211 (1998).
5. L. P. Horwitz, J. Math. Phys. 34 645 (1993)