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@article{SF_1992__44_1_135154, author = {F. Catino and F. Migliorini}, title = {Magnifying elements in semigroups.}, journal = {Semigroup forum}, pages = {314--319}, publisher = {mathdoc}, volume = {44}, number = {1}, year = {1992}, zbl = {0746.20035}, url = {http://geodesic.mathdoc.fr/item/SF_1992__44_1_135154/} }
F. Catino; F. Migliorini. Magnifying elements in semigroups.. Semigroup forum, Tome 44 (1992) no. 1, pp. 314-319. http://geodesic.mathdoc.fr/item/SF_1992__44_1_135154/