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2. N.U. Ahmed, Dynamic Systems and Control with Applications (World Scientific, Singapore, 2006)
3. N.U. Ahmed, Volterra series and nonlinear integral equations of the second kind arising from output feedback and their optimal control. J. Nonlinear Funct. Anal. 1–26 (2016)
4. N.U. Ahmed, A class of strongly nonlinear integral equations on the space of vector measures and their optimal control. Publ. Math. Debrecen 99(1-2), 1–24 (2021). https://doi.org/10.5486/PMD.2021.8639
5. N.U. Ahmed, K.L. Teo, Optimal Control of Distributed Parameter Systems (Elsevier, Amsterdam, 1981)