@article{10_4064_ap_1_1_149_165,
     author = {Jacek Szarski},
     title = {Syst\`emes d'in\'egalit\'es diff\'erentielles aux d\'eriv\'ees partielles du premier ordre, et leurs applications},
     journal = {Annales Polonici Mathematici},
     pages = {149--165},
     publisher = {mathdoc},
     volume = {1},
     number = {1},
     year = {1955},
     doi = {10.4064/ap-1-1-149-165},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-1-1-149-165/}
}