@article{MZM_1997_62_1_a2,
     author = {M. Babayev},
     title = {Approximation to the {Sobolev} classes $W_q^r$ of functions of several variables by bilinear forms in $L_p$ for $2\le q\le p\le\infty$},
     journal = {Matemati\v{c}eskie zametki},
     pages = {18--34},
     publisher = {mathdoc},
     volume = {62},
     number = {1},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1997_62_1_a2/}
}