P, T, C properties of the Poincare invariant equations for massive   particles
  We have shown quant-ph/0206104 (Lett. Nuovo Cimento, 1972, 4, 344) that for free particles and antiparticles with mass m>0 and arbitrary spin s>0, in the framework of the Poincare group P(1,3), there exist three types of nonequivalent equations. In the present paper we study the P, T, C properties of these equations. 
Wilhelm I. Fushchych (Institute of Mathematics, Kiev, Ukraine)