On the P- and T-non-invariant two-component equation for the neutrino
  The relativistic two-component equation describing the free motion of particles with zero mass and spin 1/2, which is P- and T-non-invariant but C-invariant, is found. The representation of the Poincare group for zero mass and discrete spin is constructed. The position operator for such a particle is defined. 
Wilhelm I. Fushchych (Institute of Mathematics, Kiev, Ukraine)