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@article{SF_1991__43_3_135109, author = {W.A.F. Ruppert}, title = {Endomorphic actions of {{\ss}N} on the torus group.}, journal = {Semigroup forum}, pages = {202--217}, publisher = {mathdoc}, volume = {43}, number = {3}, year = {1991}, zbl = {0739.22005}, url = {http://geodesic.mathdoc.fr/item/SF_1991__43_3_135109/} }
W.A.F. Ruppert. Endomorphic actions of ßN on the torus group.. Semigroup forum, Tome 43 (1991) no. 3, pp. 202-217. http://geodesic.mathdoc.fr/item/SF_1991__43_3_135109/