@article{10_14708_ma_v4i8_1221,
     author = {T. Sty\'s},
     title = {The maximum principle for systems of nonlinear equations},
     journal = {Mathematica Applicanda},
     pages = { 13--16},
     publisher = {mathdoc},
     volume = {4},
     number = {8},
     year = {1976},
     doi = {10.14708/ma.v4i8.1221},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/ma.v4i8.1221/}
}