@article{ASENS_1902_3_19__79_0,
     author = {Picard, \'Emile},
     title = {Sur le nombre des conditions exprimant que certaines int\'egrales doubles sont de seconde esp\`ece},
     journal = {Annales scientifiques de l'\'Ecole Normale Sup\'erieure},
     pages = {79--87},
     publisher = {Elsevier},
     volume = {3e s{\'e}rie, 19},
     year = {1902},
     doi = {10.24033/asens.506},
     language = {fr},
     url = {http://archive.numdam.org/articles/10.24033/asens.506/}
}