1. Canonical formalism for degenerate Lagrangians
2. Classical Dynamics: A Modern Perspective;Sudarshan,1974
3. Lectures on Quantum Mechanics;Dirac,1964
4. A. J. Hanson, T. Regge, and C. Teitelboim, Accademia Nationale dei Lincei, Rome, 1974
5. See also E. C. G. Sudarshan and N. Mukunda, Ref. [1].