@article{GDZPPN002064197,
title = {An elementary formula for the Fenchel-Nielsen twist.},
journal = {Commentarii mathematici Helvetici},
volume = {56},
year = {1981},
pages = {132-135},
zbl = {0467.30036},
url = {http://dml.mathdoc.fr/item/GDZPPN002064197}
}
Wolpert, Scott. An elementary formula for the Fenchel-Nielsen twist.. Commentarii mathematici Helvetici, Tome 56 (1981) pp. 132-135. http://gdmltest.u-ga.fr/item/GDZPPN002064197/