Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1962_144_1_a19, author = {L. N. Shevrin}, title = {Semigroups whose lattice of subsemigroups has relative complements}, journal = {Doklady Akademii Nauk}, pages = {72--75}, publisher = {mathdoc}, volume = {144}, number = {1}, year = {1962}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1962_144_1_a19/} }
L. N. Shevrin. Semigroups whose lattice of subsemigroups has relative complements. Doklady Akademii Nauk, Tome 144 (1962) no. 1, pp. 72-75. http://geodesic.mathdoc.fr/item/DAN_1962_144_1_a19/