SWKB and proper quantization conditions for translationally shape   invariant potentials
  Using a recently proposed classification for the primary translationally shape invariant potentials, we show that the exact quantization rule formulated by Ma and Xu is equivalent to the supersymmetric JWKB quantization condition. The energy levels for the two considered categories of shaped invariant potentials are also derived. 
Kamal Mahdi, Y Kasri (UL), Y Grandati (UL), A B\'erard (UL)
quant-ph