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Ruth Kellerhals 1
@article{AFM_2001_26_1_a1, author = {Ruth Kellerhals}, title = {Collars in {PSL(2,H)}}, journal = {Annales Fennici Mathematici}, pages = {51--72}, publisher = {mathdoc}, volume = {26}, number = {1}, year = {2001}, language = {en}, url = {http://geodesic.mathdoc.fr/item/AFM_2001_26_1_a1/} }
Ruth Kellerhals. Collars in PSL(2,H). Annales Fennici Mathematici, Tome 26 (2001) no. 1, pp. 51-72. http://geodesic.mathdoc.fr/item/AFM_2001_26_1_a1/