@article{10_21136_CMJ_1976_101393,
     author = {Sait\^o, T\^oru},
     title = {Archimedean classes in an ordered semigroup. {I}},
     journal = {Czechoslovak Mathematical Journal},
     pages = {218--238},
     publisher = {mathdoc},
     volume = {26},
     number = {2},
     year = {1976},
     doi = {10.21136/CMJ.1976.101393},
     mrnumber = {0406897},
     zbl = {0338.06005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1976.101393/}
}