@article{JMPA_1906_6_2__135_0,
     author = {Poincar\'e, H.},
     title = {Sur les p\'eriodes des int\'egrales doubles},
     journal = {Journal de Math\'ematiques Pures et Appliqu\'ees},
     pages = {135--189},
     publisher = {Gauthier-Villars},
     volume = {6e s{\'e}rie, 2},
     year = {1906},
     language = {fr},
     url = {http://www.numdam.org/item/JMPA_1906_6_2__135_0/}
}