2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/50358We generalize a regularization method of Stumpf 1984 in the case of non-linear spinor field models to fourth order theories and to non-scalar interactions. The involved discrete symmetries can be connected with C,P,T transformations.6 pages, no figures, talk at GROUP23 conference, DUBNAHigh Energy Physics - Theorytext