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@article{MAN_1989__285_1_164620, author = {Michael Shapiro}, title = {A geometric approach to the almost convexity and growth of some nilpotent groups.}, journal = {Mathematische Annalen}, pages = {601--624}, publisher = {mathdoc}, volume = {285}, number = {1}, year = {1989}, zbl = {0693.20037}, url = {http://geodesic.mathdoc.fr/item/MAN_1989__285_1_164620/} }
Michael Shapiro. A geometric approach to the almost convexity and growth of some nilpotent groups.. Mathematische Annalen, Tome 285 (1989) no. 1, pp. 601-624. http://geodesic.mathdoc.fr/item/MAN_1989__285_1_164620/