@article{10_4064_ap_2_2_219_233,
     author = {T. Wa\.zewski},
     title = {Sur certaines in\'egalit\'es aux d\'eriv\'ees partielles relatives aux fonctions poss\'edant la diff\'erentielle approximative},
     journal = {Annales Polonici Mathematici},
     pages = {219--233},
     publisher = {mathdoc},
     volume = {2},
     number = {2},
     year = {1955},
     doi = {10.4064/ap-2-2-219-233},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-2-2-219-233/}
}