Quantile Motion and Tunneling
  The concepts of quantile position, trajectory, and velocity are defined. For a tunneling quantum mechanical wave packet, it is proved that its quantile position always stays behind that of a free wave packet with the same initial parameters. In quantum mechanics the quantile trajectories are mathematically identical to Bohm's trajectories. A generalization to three dimensions is given. 
S. Brandt, H.D. Dahmen, E. Gjonaj, T. Stroh (Department of Physics,   Siegen University, Siegen, Germany)