1. P.A.M. Dirac, The Principles of Quantum Mechanics, 4th edn. (Clarendon Press, 1982)
2. J. von Neumann, Mathematical Foundations of Quantum Mechanics (Princeton University Press, 1955)
3. J.E. Roberts, J. Math. Phys. 7, 1097 (1966)
4. J.-P. Antoine, J. Math. Phys. 10, 53 (1969)
5. E. Prugovečki, Quantum Mechanics in Hilbert Space (Academic Press, 1981)