Continuous Transitions Between Quantum and Classical Motions
  Using a nonlinear Schr\"{o}dinger equation for the wave function of all systems, continuous transitions between quantum and classical motions are demonstrated for (i) the double-slit set up, (ii) the 2D harmonic oscillator and (iii) the hydrogen-like atom, all of which are of empirical interest. 
Partha Ghose and Klaus von Bloh
quant-ph