@article{ASENS_1892_3_9__63_0,
     author = {Borel, \'Emile},
     title = {Sur l'\'equation adjointe et sur certains syst\`emes d'\'equations diff\'erentielles},
     journal = {Annales scientifiques de l'\'Ecole Normale Sup\'erieure},
     pages = {63--90},
     publisher = {Elsevier},
     volume = {3e s{\'e}rie, 9},
     year = {1892},
     doi = {10.24033/asens.366},
     language = {fr},
     url = {http://www.numdam.org/articles/10.24033/asens.366/}
}