TY - JOUR AU - Berman, J. AU - Grätzer, G. AU - Platt, C. R. TI - Extending Algebras to Model Congruence Schemes JO - Canadian journal of mathematics PY - 1986 SP - 257 EP - 276 VL - 38 IS - 2 UR - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1986-012-8/ DO - 10.4153/CJM-1986-012-8 ID - 10_4153_CJM_1986_012_8 ER -