Geodesic
On the exact control of the mixed problem for the oscillating string equation
Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 3 (1990), pp. 15-20.

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The exact controls of the mixed problem for the oscillating string equations in two-dimensional space is considered. The necessary and sufficient conditions of the existence of those controls are obtained. 
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R. G. Airapetyan; L. S. Kantardjian. On the exact control of the mixed problem for the oscillating string equation. Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 3 (1990), pp. 15-20. http://geodesic.mathdoc.fr/item/UZERU_1990_3_a2/

[1] J. L. Lions, “Exact controllability, stabilization and perturbations for distributed systems”, SIAM Rev., 30:1 (1988), 1–68 | DOI | MR | Zbl

[2] D. L. Russel, “Optimal regulation of linear symmetric hyperbolic systems with finite dimensional controls”, J. SIAM Control., 4:2 (1966), 276–294 | DOI | MR | Zbl