@article{CMUC_1990__31_3_a2,
     author = {Je\v{z}ek, Jaroslav and Newrly, Norbert and T\r{u}ma, Ji\v{r}{\'\i}},
     title = {Remarks on equational theories of semilattices with operators},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {415--425},
     publisher = {mathdoc},
     volume = {31},
     number = {3},
     year = {1990},
     mrnumber = {1078475},
     zbl = {0712.08006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1990__31_3_a2/}
}