Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1965_164_3_a1, author = {Z. Hedrl{\'\i}n}, title = {Commutative systems as generalized semigroups}, journal = {Doklady Akademii Nauk}, pages = {483--486}, publisher = {mathdoc}, volume = {164}, number = {3}, year = {1965}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1965_164_3_a1/} }
Z. Hedrlín. Commutative systems as generalized semigroups. Doklady Akademii Nauk, Tome 164 (1965) no. 3, pp. 483-486. http://geodesic.mathdoc.fr/item/DAN_1965_164_3_a1/