Voir la notice de l'article provenant de la source Novi sad journal of mathematics website
@article{NSJOM_2004_34_2a_4, author = {M. Demlov\'{a} and V. Koubek}, title = {Weaker universalities in semigroup varieties}, journal = {Novi Sad Journal of Mathematics}, pages = {37-86}, publisher = {mathdoc}, volume = {34}, number = {2}, year = {2004}, url = {http://geodesic.mathdoc.fr/item/NSJOM_2004_34_2a_4/} }
M. Demlov\'{a}; V. Koubek. Weaker universalities in semigroup varieties. Novi Sad Journal of Mathematics, Tome 34 (2004) no. 2. http://geodesic.mathdoc.fr/item/NSJOM_2004_34_2a_4/