@article{10_21136_CMJ_1964_100607,
     author = {Petrich, Mario},
     title = {On the structure of a class of commutative semigroups},
     journal = {Czechoslovak Mathematical Journal},
     pages = {147--153},
     year = {1964},
     volume = {14},
     number = {1},
     doi = {10.21136/CMJ.1964.100607},
     mrnumber = {0166284},
     zbl = {0143.03403},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1964.100607/}
}