1. I. Kant, Critik der reinen Vernunft (1781)
2. D. Bohm, Quantum Theory (Prentice Hall, New York, 1966) section 12.6
3. P.R. Holland, The Quantum Theory of Motion (Cambridge University Press, Cambridge, 1993)
4. D. Durr, S. Teufel, Bohmian Mechanics: The Physics and Mathematics of Quantum Theory (Springer, Berlin, Heidelberg, 2009)
5. E. Madelung, Z. Phys. 40, 322 (1926)