Park--Tarter Matrix for a Dyon--Dyon System
  The problem of separation of variables in a dyon--dyon system is discussed. A linear transformation is obtained between fundamental bases of this system. Comparison of the dyon--dyon system with a 4D isotropic oscillator is carried out. 
L.G. Mardoyan, A.N. Sissakian, V.M. Ter-Antonyan