The Pauli Equation for Probability Distributions
  The "marginal" distributions for measurable coordinate and spin projection is introduced. Then, the analog of the Pauli equation for spin-1/2 particle is obtained for such probability distributions instead of the usual wave functions. That allows a classical-like approach to quantum mechanics. Some illuminating examples are presented. 
S. Mancini, O. V. Man'ko, V. I. Man'ko, P. Tombesi