@article{10_4064_fm_104_2_98_109,
     author = {Urszula Wilczy\'nska},
     title = {Approximate of functions of two variables},
     journal = {Fundamenta Mathematicae},
     pages = {98--109},
     publisher = {mathdoc},
     volume = {104},
     number = {2},
     year = {1979},
     doi = {10.4064/fm-104-2-98-109},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-104-2-98-109/}
}