@article{SM_1996_187_5_a0,
     author = {A. L. Garkavi and V. A. Medvedev and S. Ya. Havinson},
     title = {Existence of the~best possible uniform approximation of a~function of several variables by a~sum of functions of fewer variables},
     journal = {Sbornik. Mathematics},
     pages = {623--634},
     publisher = {mathdoc},
     volume = {187},
     number = {5},
     year = {1996},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1996_187_5_a0/}
}