@article{10_21136_CMJ_1977_101444,
     author = {Kuroki, Nobuaki},
     title = {On normal semigroups},
     journal = {Czechoslovak Mathematical Journal},
     pages = {43--53},
     publisher = {mathdoc},
     volume = {27},
     number = {1},
     year = {1977},
     doi = {10.21136/CMJ.1977.101444},
     mrnumber = {0486240},
     zbl = {0358.20074},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1977.101444/}
}