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@article{MOMA_1988__106_1_178401, author = {G\"unter Lettl}, title = {Subsemigroups of {Finitely} {Generated} {Groups} with {Divisor-Theory.}}, journal = {Monatshefte f\"ur Mathematik}, pages = {205--210}, publisher = {mathdoc}, volume = {106}, number = {1}, year = {1988}, zbl = {0671.20059}, url = {http://geodesic.mathdoc.fr/item/MOMA_1988__106_1_178401/} }
Günter Lettl. Subsemigroups of Finitely Generated Groups with Divisor-Theory.. Monatshefte für Mathematik, Tome 106 (1988) no. 1, pp. 205-210. http://geodesic.mathdoc.fr/item/MOMA_1988__106_1_178401/