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@article{CMH_1981__56_139861, author = {Scott Wolpert}, title = {An elementary formula for the {Fenchel-Nielsen} twist.}, journal = {Commentarii mathematici Helvetici}, pages = {132--135}, publisher = {mathdoc}, volume = {56}, year = {1981}, zbl = {0467.30036}, url = {http://geodesic.mathdoc.fr/item/CMH_1981__56_139861/} }
Scott Wolpert. An elementary formula for the Fenchel-Nielsen twist.. Commentarii mathematici Helvetici, Tome 56 (1981), pp. 132-135. http://geodesic.mathdoc.fr/item/CMH_1981__56_139861/