@article{10_4064_ap_38_3_229_243,
     author = {Z. Kowalski},
     title = {A difference method for a nonlinear system of elliptic equations with mixed derivatives},
     journal = {Annales Polonici Mathematici},
     pages = {229--243},
     publisher = {mathdoc},
     volume = {38},
     number = {3},
     year = {1980},
     doi = {10.4064/ap-38-3-229-243},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-38-3-229-243/}
}