@article{MZM_1996_59_1_a12,
     author = {M. Sh. Shabozov},
     title = {Exact bounds for simultaneous approximation of functions of two variables and their derivatives by bilinear splines},
     journal = {Matemati\v{c}eskie zametki},
     pages = {142--152},
     publisher = {mathdoc},
     volume = {59},
     number = {1},
     year = {1996},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1996_59_1_a12/}
}