TY - JOUR AU - Sobral, Manuela TI - Absolutely closed spaces and categories of algebras JO - Portugaliae mathematica PY - 1990 SP - 341 EP - 351 VL - 47 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/PORMA_1990__47_4_115723/ LA - en ID - PORMA_1990__47_4_115723 ER -