TY - JOUR AU - I. NÉMETI TI - From hereditary classes to varieties in abstract model theory and partial algebra JO - Beiträge zur Algebra und Geometrie PY - 1978 SP - 69 EP - 78 VL - 7 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/BAG_1978__7_138149/ ID - BAG_1978__7_138149 ER -