@article{10_21136_CMJ_1978_101533,
     author = {Numakura, Katsumi},
     title = {On $q$-ideals in compact semigroups},
     journal = {Czechoslovak Mathematical Journal},
     pages = {312--323},
     publisher = {mathdoc},
     volume = {28},
     number = {2},
     year = {1978},
     doi = {10.21136/CMJ.1978.101533},
     mrnumber = {0470135},
     zbl = {0394.22004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1978.101533/}
}