@article{10_21136_CMJ_1977_101446,
     author = {Satyanarayana, M.},
     title = {On commutative semigroups which are unions of a finite number of principal ideals},
     journal = {Czechoslovak Mathematical Journal},
     pages = {61--68},
     publisher = {mathdoc},
     volume = {27},
     number = {1},
     year = {1977},
     doi = {10.21136/CMJ.1977.101446},
     mrnumber = {0439960},
     zbl = {0361.20062},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1977.101446/}
}