1. Balian, R., and Itzykson, C. (1986). Observations sur la mécanique quantique finie,Comptes Rendus de l'Academie des Sciences Paris Serie I,303(16), 773?778.
2. Bertrand, J., and Irac, M. (1979).Letters in Mathematical Physics,3, 97?107.
3. Berezin, F. A. (1980).Uspekhi Fizicheskikh Nauk,132, 497?548.
4. Dowker, J. S. (1976).Journal of Mathematical Physics,17, 1873?1874.
5. Feynman, R. P., and Hibbs, A. R. (1955).Quantum Mechanics and Path Integrals, McGraw-Hill, New York.