Voir la notice de l'article provenant de la source eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts
@article{MV_1972_24_1_a46, author = {S. Lajos}, title = {A characterization of semilattices of left groups}, journal = {Matemati\v{c}ki vesnik}, pages = {363 }, publisher = {mathdoc}, volume = {24}, number = {1}, year = {1972}, url = {http://geodesic.mathdoc.fr/item/MV_1972_24_1_a46/} }
S. Lajos. A characterization of semilattices of left groups. Matematički vesnik, Tome 24 (1972) no. 1, p. 363 . http://geodesic.mathdoc.fr/item/MV_1972_24_1_a46/