@article{CMUC_2005__46_2_a3,
     author = {Demlov\'a, M. and Koubek, V.},
     title = {Weak alg-universality and $Q$-universality of semigroup quasivarieties},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {257--279},
     publisher = {mathdoc},
     volume = {46},
     number = {2},
     year = {2005},
     mrnumber = {2176891},
     zbl = {1120.20059},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_2005__46_2_a3/}
}