@article{JMPA_1908_6_4__331_0,
     author = {Goursat, E.},
     title = {Sur les invariants int\'egraux},
     journal = {Journal de Math\'ematiques Pures et Appliqu\'ees},
     pages = {331--365},
     publisher = {Gauthier-Villars},
     volume = {6e s{\'e}rie, 4},
     year = {1908},
     language = {fr},
     url = {http://www.numdam.org/item/JMPA_1908_6_4__331_0/}
}