1. Galileo Galilei, “Dialogue Concerning the Two Chief World Systems Ptolemic and Copernican” (Univ. of California Press, Berkeley, 1967). 2. See for example, E.C.G.Sudarshan and N.Mukunda, “Classical Dynamics: A Modern Perspective” (J.Wiley, New York, 1974) chap.19.
2. See for example, E.C.G.Sudarshan and N.Mukunda, “Classical Dynamics: A modern Perspective” (J.Wiley, New York, 1974) chap.19.
3. G.Marmo, G.Morandi, A.Simoni and E.C.G.Sudarshan, Phys. Rev.D37: 2196 (1988).
4. See for example, D.E.Soper, “Classical Field Theory” (J.Wiley, New York, 1976) sect. 7.3.
5. E.P.Wigner, Ann. Math.40: 149(1939);