[en] Principle of operation of a covariant canonical quantization scheme considered earlier has been demonstrated using a simple example. It is obvious that couplings and commutation relations in new variables realizing explicitly the Poincare group representation may be deciphered in these variables, at least, in loop expansion terms and lead in the first approximation to reasonable results. One has nothing to say yet for higher orders as the algebraic structure of these relations is not clear unlike the replacement of variables in integrals. As to more complicate models, the similar procedure is applied to them only with purely algebraic complications