Relativistic generalization of Bell's inequalities in Wigner's form

A relativistic generalization of Bell's inequalities in Wigner's form was obtained for the decays of a pseudoscalar and a scalar particle to two particles having a nonzero spin (fermions and photons). Both inequalities involving a full anticorrelation of final-particle spins and having a nonrelativistic analog and inequalities involving a full correlation of spins are considered. It is shown that Bohr's complementarity principle may be tested experimentally in the relativistic region.