@article{BAG_1978__7_138149,
     author = {I. N\'EMETI},
     title = {From hereditary classes to varieties in abstract model theory and partial algebra},
     journal = {Beitr\"age zur Algebra und Geometrie},
     pages = {69--78},
     publisher = {mathdoc},
     volume = {7},
     year = {1978},
     zbl = {0415.08002},
     url = {http://geodesic.mathdoc.fr/item/BAG_1978__7_138149/}
}