@article{RM_1960_15_6_a4,
     author = {V. G. Boltyanskii and S. S. Ryshkov and Yu. A. Shashkin},
     title = {On $k$-regular imbeddings and on applications to theory of function approximation},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     publisher = {mathdoc},
     volume = {15},
     number = {6},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1960_15_6_a4/}
}