Exactly solvable systems and the Quantum Hamilton-Jacobi formalism
  We connect Quantum Hamilton-Jacobi Theory with supersymmetric quantum mechanics (SUSYQM). We show that the shape invariance, which is an integrability condition of SUSYQM, translates into fractional linear relations among the quantum momentum functions. 
Constantin Rasinariu, John J. Dykla, Asim Gangopadhyaya, Jeffry V.   Mallow