@article{10_4064_sm_15_2_201_215,
     author = {A. Alexiewicz and W. Orlicz},
     title = {Some remarks on the existence and uniqueness of solutions of the hyperbolic equation \ensuremath{\partial}{\texttwosuperior}z/(\ensuremath{\partial}x\ensuremath{\partial}y)=f(x,y,x,\ensuremath{\partial}z/\ensuremath{\partial}x,\ensuremath{\partial}z/\ensuremath{\partial}y)},
     journal = {Studia Mathematica},
     pages = {201--215},
     publisher = {mathdoc},
     volume = {15},
     number = {2},
     year = {1955},
     doi = {10.4064/sm-15-2-201-215},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-15-2-201-215/}
}