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Additional information
Voronezh. Translated fromSibirskiĭ Maternaticheskiĭ Zhurnal, Vol. 40, No. 6, pp. 1223–1225, November–December, 1999.
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Astakhov, A.T. Harmonic functions vanishing on cones: A criterion for existence. Sib Math J 40, 1031–1033 (1999). https://doi.org/10.1007/BF02677525
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DOI: https://doi.org/10.1007/BF02677525