@article{10_4064_ap_36_1_85_93,
     author = {Micha{\l} Kisielewicz},
     title = {On the nonconvergence of successive approximations in the theory of the equation $z"_{xy} = f(x, y, z, z'_x,z'_y)$},
     journal = {Annales Polonici Mathematici},
     pages = {85--93},
     publisher = {mathdoc},
     volume = {36},
     number = {1},
     year = {1979},
     doi = {10.4064/ap-36-1-85-93},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-36-1-85-93/}
}