@article{MZM_2004_75_4_a7,
     author = {A. S. Kochurov},
     title = {Approximation by {Piecewise} {Constant} {Functions} on a {Square}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {592--602},
     publisher = {mathdoc},
     volume = {75},
     number = {4},
     year = {2004},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2004_75_4_a7/}
}