@article{1183512047, author = {Gage, Walter H.}, title = {Proof of a formula of Liouville}, journal = {Bull. Amer. Math. Soc.}, volume = {54}, number = {12}, year = {1948}, pages = { 581-586}, language = {en}, url = {http://dml.mathdoc.fr/item/1183512047} }
Gage, Walter H. Proof of a formula of Liouville. Bull. Amer. Math. Soc., Tome 54 (1948) no. 12, pp. 581-586. http://gdmltest.u-ga.fr/item/1183512047/