@article{ARM_2006__42_4_a2,
     author = {Demlov\'a, Marie and Koubek, V\'aclav},
     title = {On universality of semigroup varieties},
     journal = {Archivum mathematicum},
     pages = {357--386},
     publisher = {mathdoc},
     volume = {42},
     number = {4},
     year = {2006},
     mrnumber = {2283018},
     zbl = {1152.20046},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_2006__42_4_a2/}
}