@article{10_21136_CPM_1981_118103,
     author = {\v{S}ik, Franti\v{s}ek},
     title = {Joins of congruences in $\Omega $-groups},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky},
     pages = {299--310},
     publisher = {mathdoc},
     volume = {106},
     number = {3},
     year = {1981},
     doi = {10.21136/CPM.1981.118103},
     mrnumber = {629728},
     zbl = {0472.08001},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPM.1981.118103/}
}