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Original Russian Text © C. Tunç, E. Tunç, 2006, published in Differentsial’nye Uravneniya, 2006, Vol. 42, No. 1, pp. 135–138.
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Tunç, C., Tunç, E. An instability theorem for a class of eighth-order differential equations. Diff Equat 42, 150–154 (2006). https://doi.org/10.1134/S0012266106010149
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DOI: https://doi.org/10.1134/S0012266106010149