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Sobhy El-sayed, I., Faried, N. & Attia, G.M. On the L 2w -Solutions of General Second-Order Nonsymmetric Differential Equations. Siberian Mathematical Journal 42, 174–181 (2001). https://doi.org/10.1023/A:1004814114742
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DOI: https://doi.org/10.1023/A:1004814114742