@article{10_4064_ap_7_2_233_240,
     author = {J. Kisy\'nski},
     title = {Sur la convergence des approximations successives pour l'\'equation $\frac{\ensuremath{\partial}{\texttwosuperior}z}{\ensuremath{\partial}x\ensuremath{\partial}y} = f(x,y,z,\frac{\ensuremath{\partial}z}{\ensuremath{\partial}x},\frac{\ensuremath{\partial}z}{\ensuremath{\partial}y})$},
     journal = {Annales Polonici Mathematici},
     pages = {233--240},
     publisher = {mathdoc},
     volume = {7},
     number = {2},
     year = {1959},
     doi = {10.4064/ap-7-2-233-240},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-7-2-233-240/}
}