Voir la notice de l'article provenant de la source Novi sad journal of mathematics website
@article{NSJOM_2010_40_2a_16, author = {Edmond W. H. Lee}, title = {On a semigroup variety of {Gy\"orgy} {Poll\'ak}}, journal = {Novi Sad Journal of Mathematics}, pages = {67-73}, publisher = {mathdoc}, volume = {40}, number = {2}, year = {2010}, url = {http://geodesic.mathdoc.fr/item/NSJOM_2010_40_2a_16/} }
Edmond W. H. Lee. On a semigroup variety of György Pollák. Novi Sad Journal of Mathematics, Tome 40 (2010) no. 2. http://geodesic.mathdoc.fr/item/NSJOM_2010_40_2a_16/