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@article{SF_1991__43_3_135093, author = {K.H. Neeb}, title = {Semigroups in the universal covering of {SL(2).}}, journal = {Semigroup forum}, pages = {33--44}, publisher = {mathdoc}, volume = {43}, number = {3}, year = {1991}, zbl = {0736.22005}, url = {http://geodesic.mathdoc.fr/item/SF_1991__43_3_135093/} }
K.H. Neeb. Semigroups in the universal covering of SL(2).. Semigroup forum, Tome 43 (1991) no. 3, pp. 33-44. http://geodesic.mathdoc.fr/item/SF_1991__43_3_135093/