1. P.A.M. Dirac, The Principles of Quantum Mechanics, Clarendon Press, Oxford, 1956, p. 114.
2. R.P. Feynman, Rev. Mod. Phys. 20 (1948) 367. R.P. Feynman, Phys. Rev. 84 (1951) 108. R.P. Feynman, A.R. Hibbs, Quantum Mechanics and Path Integrals, McGraw-Hill, New York, 1965. The idea of using the classical action in quantum mechanics was first proposed by Dirac in P.A.M. Dirac, Phys. Z. Sowietunion 3 (1933) 64 (reprinted in: J. Schwinger, Quantum Electrodynamics, Dover, New York, 1958).
3. Quantum‐mechanical path integrals with Wiener measure for all polynomial Hamiltonians. II
4. Wiener measures for path integrals with affine kinematic variables
5. Quantization is geometry, after all