@article{PDML_1983___3B_A1_0,
     author = {Patissier, Guy},
     title = {1 {Structure} de contact et \'equations aux d\'eriv\'ees partielles d'apr\`es {V.} {V.} {Lychagin}},
     journal = {Publications du D\'epartement de math\'ematiques (Lyon)},
     pages = {1--32},
     publisher = {Universit\'e Claude Bernard - Lyon 1},
     number = {3B},
     year = {1983},
     mrnumber = {725511},
     zbl = {0516.58002},
     language = {fr},
     url = {http://www.numdam.org/item/PDML_1983___3B_A1_0/}
}