@article{DAN_1960_131_1_a6,
     author = {S. A. Smolyak},
     title = {$\varepsilon$-entropy of the classes $E_s^{\alpha,k}(B)$ and $W_s^\alpha(B)$ in the metric of $L_2$},
     journal = {Doklady Akademii Nauk},
     pages = {30--33},
     publisher = {mathdoc},
     volume = {131},
     number = {1},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1960_131_1_a6/}
}