TY - JOUR TI - Congruence amalgamation of lattices T3 - Acta scientiarum mathematicarum AU - Grätzer George A. PY - 2000 LA - English SN - 0001-6969 UR - http://acta.bibl.u-szeged.hu/15789/1/math_066_numb_001_002_003-022.pdf ER -