2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/176703The necessity of adding higher order multiquark interactions to the three flavor NJL model with $U_A(1)$ breaking, in order to stabilize its vacuum, is discussed.3 pages, 1 figure, prepared for the proceedings of Quark Confinement and the Hadron Spectrum VII, 2-7 Sep. 2006, Acores, PortugalHigh Energy Physics - Phenomenologytext