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5. M. I. Sumin, “Optimal Control of Parabolic Equations: Dual Numerical Methods and Regularization,” in Distributed-Parameter Systems: Optimization and Application to Economics and Environmental Sciences (Inst Mat. Mekh. Ural. Otd. Ross. Akad. Nauk, Yekaterinburg, 2000), pp. 66–69 [in Russian].