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@article{SF_1980__20_134417, author = {L. Satko and O. Grosek}, title = {A new notion in the theory of semigroups.}, journal = {Semigroup forum}, pages = {233--240}, publisher = {mathdoc}, volume = {20}, year = {1980}, zbl = {0439.20045}, url = {http://geodesic.mathdoc.fr/item/SF_1980__20_134417/} }
L. Satko; O. Grosek. A new notion in the theory of semigroups.. Semigroup forum, Tome 20 (1980), pp. 233-240. http://geodesic.mathdoc.fr/item/SF_1980__20_134417/