@article{10_21136_CMJ_1972_101123,
     author = {Pond\v{e}l{\'\i}\v{c}ek, Bed\v{r}ich},
     title = {A characterization of semilattices of left or right groups},
     journal = {Czechoslovak Mathematical Journal},
     pages = {522--524},
     publisher = {mathdoc},
     volume = {22},
     number = {4},
     year = {1972},
     doi = {10.21136/CMJ.1972.101123},
     mrnumber = {0313431},
     zbl = {0247.20073},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1972.101123/}
}