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Translated from Matematicheskie Zametki, Vol. 45, No. 1, pp. 57–65, January, 1989.
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Maz'ya, V.G., Poborchii, S.V. Traces of functions with summable gradient in a domain with a peak summit on the boundary. Mathematical Notes of the Academy of Sciences of the USSR 45, 39–44 (1989). https://doi.org/10.1007/BF01158714
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DOI: https://doi.org/10.1007/BF01158714