@article{JRAM_1973__258_151283,
     author = {Mario Petrich},
     title = {Dense extensions of completely 0-simple semigroups. {I.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {103--125},
     publisher = {mathdoc},
     volume = {258},
     year = {1973},
     zbl = {0256.20081},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1973__258_151283/}
}