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Math. Notes 93, No. 6, 917-922 (2013); translation from Mat. Zametki 93, No. 6, 932-938 (2013); erratum ibid. 104, No. 6, 944 (2018).
MSC:  41A17
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Math. Notes 93, No. 6, 890-905 (2013); translation from Mat. Zametki 93, No. 6, 902-919 (2013).
MSC:  37C15 37C29 37D05
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