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Il'in, V.A., Pokornyi, Y.V. & Borovskikh, A.V. Pontryagin Readings–XIV at Voronezh Spring Mathematical School “Modern Methods in Qualitative Theory of Boundary Value Problems”. Differential Equations 39, 1661–1662 (2003). https://doi.org/10.1023/B:DIEQ.0000019363.33228.10
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DOI: https://doi.org/10.1023/B:DIEQ.0000019363.33228.10