Voir la notice de l'article provenant de la source Math-Net.Ru
@article{AL_1980_19_5_a3, author = {E. A. Palyutin}, title = {Categorical {Horn} classes. {I}}, journal = {Algebra i logika}, pages = {582--614}, publisher = {mathdoc}, volume = {19}, number = {5}, year = {1980}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1980_19_5_a3/} }
E. A. Palyutin. Categorical Horn classes. I. Algebra i logika, Tome 19 (1980) no. 5, pp. 582-614. http://geodesic.mathdoc.fr/item/AL_1980_19_5_a3/