1. M. M. Potapov and D. A. Ivanov, “Problems of two-sided boundary control for the wave equation on subcritical intervals in classes of strong generalized solutions,” Tr. Inst. Mat. Mekh., Ural. Otd. Ross. Akad. Nauk 19 (4), 192–202 (2013) [Proc. Steklov Inst. Math. 287 (Suppl. 1), S145–S155 (2014)].
2. D. A. Ivanov and M. M. Potapov, “Continuous invertibility of a boundary control operator for the wave equation on subcritical intervals in classes of weak generalized solutions,” Vestn. Mosk. Univ., Ser. 15: Vychisl. Mat. Kibern., No. 4, 5–12 (2014) [Moscow Univ. Comput. Math. Cybern. 38, 139–146 (2014)].
3. M. M. Potapov and A. A. Dryazhenkov, “Threshold optimization in observability inequality for the wave equation with homogeneous Robin-type boundary condition,” Tr. Mat. Inst. im. V.A. Steklova, Ross. Akad. Nauk 277, 215–229 (2012) [Proc. Steklov Inst. Math. 277, 206–220 (2012)].
4. F. P. Vasil’ev, “Iterative methods for solving time optimal problems for parabolic equations,” Zh. Vychisl. Mat. Mat. Fiz. 10 (4), 942–957 (1970) [USSR Comput. Math. Math. Phys. 10 (4), 171–190 (1970)].
5. F. P. Vasil’ev and R. P. Ivanov, “On approximate solution of the time optimal problem in Banach spaces with constraints on the phase coordinates,” Zh. Vychisl. Mat. Mat. Fiz. 11 (2), 328–347 (1971) [USSR Comput. Math. Math. Phys. 11 (2), 45–67 (1971)].