@article{JRAM_1952__189_150202,
     author = {G. Reeb},
     title = {Sur les \'el\'ements de contact lin\'eaires du second ordre attach\'es \`a un syst\`eme diff\'erentiel.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {186--189},
     publisher = {mathdoc},
     volume = {189},
     year = {1952},
     zbl = {0045.36804},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1952__189_150202/}
}