@article{TM_1979_150_a4,
     author = {V. I. Burenkov and B. L. Fain},
     title = {Extension of functions from anisotropic spaces with preservation of class},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {52--66},
     publisher = {mathdoc},
     volume = {150},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1979_150_a4/}
}