2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/54996The procedure for Abelian conversion of second class constraints due to Batalin, Fradkin, Fradkina and Tyutin is considered at quantum level, by using the field-antifield formalism. It is argued that quantum effects can obstruct the process. In this case, Wess-Zumino fields may be introduced in order to restore the lost symmetries.15 pages, LatexHigh Energy Physics - Theorytext