@article{1183496974, author = {Langer, R. E.}, title = {An inverse problem in differential equations}, journal = {Bull. Amer. Math. Soc.}, volume = {39}, number = {12}, year = {1933}, pages = { 814-820}, language = {en}, url = {http://dml.mathdoc.fr/item/1183496974} }
Langer, R. E. An inverse problem in differential equations. Bull. Amer. Math. Soc., Tome 39 (1933) no. 12, pp. 814-820. http://gdmltest.u-ga.fr/item/1183496974/