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Translated from Differentsial’nye Uravneniya, Vol. 40, No. 11, 2004, pp. 1579–1580. Original Russian Text Copyright © 2004 by the Editorial Board.
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Borovskikh, A.V., Il’in, V.A. & Pokornyi, Y.V. “Pontryagin Readings-XV” at voronezh spring mathematical school “modern methods in qualitative theory of boundary value problems”. Diff Equat 40, 1665–1666 (2004). https://doi.org/10.1007/PL00021836
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DOI: https://doi.org/10.1007/PL00021836