1. Sundermeyer, K. (1981). Constrained Dynamics, Springer Verlag, Berlin.
2. Landau, L. and Lifshitz, E. M. (1980). Field Theory, Mir, Moscow.
3. Dirac, P. A. M. (1964). Lectures on Quantum Mechanics, Yeshiva University, New York
4. Pons, J. M. and Salisbury, D. C. (1995). Class. Quant. Grav. 12, 1771
5. Pons, J. M., Salisbury, D. C., and Shepley, L. C. (1997). Phys. Rev. D 55, 658