@article{TRSPY_1984_170_a14,
     author = {P. I. Lizorkin and M. O. Otelbaev},
     title = {Estimates of approximate numbers of the imbedding operators for spaces of {Sobolev} type with weights},
     journal = {Informatics and Automation},
     pages = {213--232},
     publisher = {mathdoc},
     volume = {170},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1984_170_a14/}
}