On the question of the density of infinitely differentiable functions in Besov spaces
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Investigations in the theory of differentiable functions of many variables and its applications. Part 10, Tome 170 (1984), pp. 203-212.

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     author = {Yu. V. Kuznetsov},
     title = {On the question of the density of infinitely differentiable functions in {Besov} spaces},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {203--212},
     publisher = {mathdoc},
     volume = {170},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1984_170_a13/}
}
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Yu. V. Kuznetsov. On the question of the density of infinitely differentiable functions in Besov spaces. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Investigations in the theory of differentiable functions of many variables and its applications. Part 10, Tome 170 (1984), pp. 203-212. http://geodesic.mathdoc.fr/item/TM_1984_170_a13/