@article{1183524664, author = {Lewittes, Joseph}, title = {Invariant quadratic differentials}, journal = {Bull. Amer. Math. Soc.}, volume = {68}, number = {6}, year = {1962}, pages = { 320-322}, language = {en}, url = {http://dml.mathdoc.fr/item/1183524664} }
Lewittes, Joseph. Invariant quadratic differentials. Bull. Amer. Math. Soc., Tome 68 (1962) no. 6, pp. 320-322. http://gdmltest.u-ga.fr/item/1183524664/