Canonical quantization of relativistic particle
Gitman D. M. , Tyutin I. V.
In a new interpretation, a reparametrization-invariant action of a relativistic particle—at the classical level—describes a particle and an antiparticle simultaneously. A canonical gauge in which a description of this sort is realized in a natural way is pointed out. A canonical quantization of a spinor particle in such a gauge is carried out.