Globally singularity-free semi-classical wave functions in closed form
  We use a factorization technique and representation of canonical transformations to construct globally valid closed form expressions without singularities of semi-classical wave functions for arbitrary smooth potentials over a one-dimensional position space. 
C. Jung (1), F. Leyvraz (1) and T.H. Seligman (1) ((1) Centro de   Ciencias Fisicas, Cuernavaca, Mexico)