@article{JMPA_1846_1_11__96_0,
     author = {Besge},
     title = {Sur l'\'equation $\frac{d^2y}{dt^2}=\frac{y}{\left(e^t+e^{-t}\right)^2}$},
     journal = {Journal de Math\'ematiques Pures et Appliqu\'ees},
     pages = {96--96},
     publisher = {Gauthier-Villars},
     volume = {1e s{\'e}rie, 11},
     year = {1846},
     language = {fr},
     url = {http://www.numdam.org/item/JMPA_1846_1_11__96_0/}
}