Author: Ibrahim, Sobhy El-sayed

Ibrahim, Sobhy El-sayed: The spectra of general differential operators in the direct sum spaces. (English). Czechoslovak Mathematical Journal, vol. 54 (2004), issue 1, pp. 9-29
Ibrahim, Sobhy El-sayed: On $L^2_w$-quasi-derivatives for solutions of perturbed general quasi-differential equations. (English). Czechoslovak Mathematical Journal, vol. 49 (1999), issue 4, pp. 877-890

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