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@article{SF_1979__18_134349, author = {H. Grassmann}, title = {On factor {S-sets} of monoids modulo submonoids.}, journal = {Semigroup forum}, pages = {163--172}, publisher = {mathdoc}, volume = {18}, year = {1979}, zbl = {0419.20049}, url = {http://geodesic.mathdoc.fr/item/SF_1979__18_134349/} }
H. Grassmann. On factor S-sets of monoids modulo submonoids.. Semigroup forum, Tome 18 (1979), pp. 163-172. http://geodesic.mathdoc.fr/item/SF_1979__18_134349/