1. P. Dirac, The Principles of Quantum Mechanics (Oxford University Press, Oxford, 1930)
2. L. Landau, Das Dampfungsproblem in der Wellenmechanik. Z. Phys. 45, 430–441 (1927)
3. J. von Neumann, Mathematische Grundlagen der Quantenmechanik (Springer, Berlin, 1932)
4. M.A. Nielsen, I.L. Chuang, Quantum Computation and Quantum Information (Cambridge University Press, Cambridge, 2010)
5. I. Bengtsson, K. Zyczkowski, Geometry of Quantum States: An Introduction to Quantum Entanglement (Cambridge University Press, Cambridge, 2008)