@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},
     year = {2010},
     volume = {40},
     number = {2},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_2010_40_2a_16/}
}