@article{10_21136_CMJ_1986_102120,
     author = {Pond\v{e}l{\'\i}\v{c}ek, Bed\v{r}ich},
     title = {Tolerance distributive and tolerance {Boolean} varieties of semigroups},
     journal = {Czechoslovak Mathematical Journal},
     pages = {617--622},
     publisher = {mathdoc},
     volume = {36},
     number = {4},
     year = {1986},
     doi = {10.21136/CMJ.1986.102120},
     mrnumber = {863191},
     zbl = {0612.20033},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1986.102120/}
}