Prepotential approach to solvable rational extensions of Harmonic   Oscillator and Morse potentials
  We show how the recently discovered solvable rational extensions of Harmonic Oscillator and Morse potentials can be constructed in a direct and systematic way, without the need of supersymmetry, shape invariance, Darboux-Crum and Darboux-B\"acklund transformations 
C.-L. Ho
math-ph math.MP math.SP nlin.SI quant-ph