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@article{MZ_1974__138_172095, author = {J\"org Flum}, title = {On {Horn} {Theories.}}, journal = {Mathematische Zeitschrift}, pages = {205--212}, publisher = {mathdoc}, volume = {138}, year = {1974}, zbl = {0275.02046}, url = {http://geodesic.mathdoc.fr/item/MZ_1974__138_172095/} }
Jörg Flum. On Horn Theories.. Mathematische Zeitschrift, Tome 138 (1974), pp. 205-212. http://geodesic.mathdoc.fr/item/MZ_1974__138_172095/