On Parasupersymmetries in Relativistic Coulomb Problem for the Modified   Stueckelberg Equation
  This paper presents a first example of parasupersymmetric relativistic quantum-mechanical model with non-oscillator-like interaction: the Coulomb problem for the modified Stueckelberg equation, describing a relativistic massive spin-1 particle in the electromagnetic field of a point charge. 
Artur Sergyeyev