@article{JMPA_1930_9_9__333_0,
     author = {Gambier, Bertrand},
     title = {Int\'egrales quadratiques de l'\'equation $\frac{\delta^2\theta}{\delta u\delta v}=\left[-\frac{6}{\left(u-v\right)^2}+\frac{2}{\left(u+v\right)^2}\right]\theta$},
     journal = {Journal de Math\'ematiques Pures et Appliqu\'ees},
     pages = {333--361},
     publisher = {Gauthier-Villars},
     volume = {9e s{\'e}rie, 9},
     year = {1930},
     language = {fr},
     url = {http://www.numdam.org/item/JMPA_1930_9_9__333_0/}
}