@article{ASENS_1905_3_22__539_0, author = {Davidoglou, A.}, title = {\'Etude de l'\'equation diff\'erentielle ${d^2[\theta (x){d^2y\over dx^2}]\over dx^2}=k\phi (x)y$}, journal = {Annales scientifiques de l'\'Ecole Normale Sup\'erieure}, pages = {539--565}, publisher = {Elsevier}, volume = {3e s{\'e}rie, 22}, year = {1905}, doi = {10.24033/asens.560}, language = {fr}, url = {archive.numdam.org/item/ASENS_1905_3_22__539_0/} }
Davidoglou, A. Étude de l’équation différentielle ${d^2[\theta (x){d^2y\over dx^2}]\over dx^2}=k\phi (x)y$. Annales scientifiques de l'École Normale Supérieure, Série 3, Tome 22 (1905) , pp. 539-565. doi : 10.24033/asens.560. http://archive.numdam.org/item/ASENS_1905_3_22__539_0/