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Additional information
Zelenyi Settlement, Moscow Region. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 26, No. 6, pp. 141–152, November–December, 1985.
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Shan'kov, V.V. A mollifying operator with a variable radius, and an inverse theorem on traces. Sib Math J 26, 891–901 (1985). https://doi.org/10.1007/BF00969111
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DOI: https://doi.org/10.1007/BF00969111