Voir la notice de l'article provenant de la source Math-Net.Ru
@article{AL_1969_8_2_a6, author = {A. A. Urman}, title = {Groupoid of varieties of certain algebras}, journal = {Algebra i logika}, pages = {241--250}, publisher = {mathdoc}, volume = {8}, number = {2}, year = {1969}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1969_8_2_a6/} }
A. A. Urman. Groupoid of varieties of certain algebras. Algebra i logika, Tome 8 (1969) no. 2, pp. 241-250. http://geodesic.mathdoc.fr/item/AL_1969_8_2_a6/