1. Beitrometti, E. G., and Cassinelli, G. (1981).The Logic of Quantum Mechanics, Addison-Wesley, Reading, Massachusetts.
2. Birkhoff, G., and von Neumann, J. (1936).Annals of Mathematics,37, 823.
3. Finkelstein, D., Jauch, J. M., and Speiser, D. (1959). CERN Report 59-7.
4. Horwitz, L. P., and Biedenharn, L. C. (1984).Annals of Physics,157, 432.
5. Jauch, J. M. (1968). InGroup Theory and Its Applications, Vol. I, E. Lobel, ed., Addison-Wesley, Reading, Massachusetts.