3 citations to https://www.mathnet.ru/eng/dan40124
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S. N. Kudryavtsev, “Extension of Functions from Isotropic Nikol'skii–Besov Spaces and Their Approximation together with Derivatives”, Math. Notes, 108:5 (2020), 688–696
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I. M. Pupyshev, “The Extension of Functions of Sobolev Classes Beyond the Boundary of the Domain on Carnot Groups”, Siberian Adv. Math., 18:2 (2008), 124–141
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S. K. Vodop'yanov, V. M. Gol'dstein, Yu. G. Reshetnyak, “On geometric properties of functions with generalized first derivatives”, Russian Math. Surveys, 34:1 (1979), 19–74