@article{TM_1987_180_a127,
     author = {Yu. N. Subbotin},
     title = {The error in multidimensional piecewise polynomial approximation},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {208--209},
     year = {1987},
     volume = {180},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1987_180_a127/}
}