@article{10_4064_ap_11_1_75_106,
     author = {M. Kwapisz and B. Palczewski and W. Pawelski},
     title = {Sur l'existence et l'unicit\'e des solutions de certaines \'equations diff\'erentielles du type $_u{xyz} = f(x,y,z,u,u_x,u_y,u_z,u_{xy}, u_{xz},u_{yz})$},
     journal = {Annales Polonici Mathematici},
     pages = {75--106},
     publisher = {mathdoc},
     volume = {11},
     number = {1},
     year = {1961},
     doi = {10.4064/ap-11-1-75-106},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-11-1-75-106/}
}