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@article{MS2_1991__68_1_167146, author = {Mika Sepp\"al\"a and Tuomas Sorvali}, title = {Traces of commutators of {M\"obius} transformations.}, journal = {Mathematica Scandinavica}, pages = {53--58}, publisher = {mathdoc}, volume = {68}, number = {1}, year = {1991}, zbl = {0898.30037}, url = {http://geodesic.mathdoc.fr/item/MS2_1991__68_1_167146/} }
Mika Seppälä; Tuomas Sorvali. Traces of commutators of Möbius transformations.. Mathematica Scandinavica, Tome 68 (1991) no. 1, pp. 53-58. http://geodesic.mathdoc.fr/item/MS2_1991__68_1_167146/