@article{10_21136_CMJ_1966_100710,
     author = {Steinfeld, Otto},
     title = {On semigroups which are unions of completely 0-simple subsemigroups},
     journal = {Czechoslovak Mathematical Journal},
     pages = {63--69},
     publisher = {mathdoc},
     volume = {16},
     number = {1},
     year = {1966},
     doi = {10.21136/CMJ.1966.100710},
     mrnumber = {0188328},
     zbl = {0141.02002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1966.100710/}
}