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@article{SF_1989__39_2_134996, author = {W.A.F. Ruppert}, title = {On open subsemigroups of connected groups.}, journal = {Semigroup forum}, pages = {347--362}, publisher = {mathdoc}, volume = {39}, number = {2}, year = {1989}, zbl = {0676.22001}, url = {http://geodesic.mathdoc.fr/item/SF_1989__39_2_134996/} }
W.A.F. Ruppert. On open subsemigroups of connected groups.. Semigroup forum, Tome 39 (1989) no. 2, pp. 347-362. http://geodesic.mathdoc.fr/item/SF_1989__39_2_134996/