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@article{MAN_1992__294_4_165021, author = {Ilkka Holopainen and Seppo Rickman}, title = {Quasiregular mappings of the {Heisenberg} group.}, journal = {Mathematische Annalen}, pages = {625--644}, publisher = {mathdoc}, volume = {294}, number = {4}, year = {1992}, zbl = {0754.30018}, url = {http://geodesic.mathdoc.fr/item/MAN_1992__294_4_165021/} }
Ilkka Holopainen; Seppo Rickman. Quasiregular mappings of the Heisenberg group.. Mathematische Annalen, Tome 294 (1992) no. 4, pp. 625-644. http://geodesic.mathdoc.fr/item/MAN_1992__294_4_165021/