23 citations to https://www.mathnet.ru/rus/rm229
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Grinevich P.G., Novikov S.P., “Topological phenomena in the real periodic sine-Gordon theory”, Integrability, topological solitons and beyond, J. Math. Phys., 44, no. 8, 2003, 3174–3184
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Grinevich P.G., Novikov S.P., “Topological charge of the real periodic finite-gap sine-Gordon solutions”, Comm. Pure Appl. Math., 56:7 (2003), 956–978
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А. Б. Богатырев, “Эффективный подход к задачам о наименьшем уклонении”, Матем. сб., 193:12 (2002), 21–40 ; A. B. Bogatyrev, “Effective approach to least deviation problems”, Sb. Math., 193:12 (2002), 1749–1769