@article{ZVMMF_1978_18_4_a12,
     author = {V. N. Orlov},
     title = {Piecewise polynomial approximation in $W^1_2$ of functions from $W^2_p$, $1<p\le2$},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {935--942},
     publisher = {mathdoc},
     volume = {18},
     number = {4},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1978_18_4_a12/}
}