TY - JOUR AU - Leandro MarĂ­n AU - Valdis Laan TI - Firm homomorphisms of rings and semigroups JO - Theory and applications of categories PY - 2023 SP - 625 EP - 666 VL - 39 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/TAC_2023_39_a21/ LA - en ID - TAC_2023_39_a21 ER -