Geodesic
On the control problem for hyperbolic general equations
Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 2 (1991), pp. 53-63.

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The article is on the exact control problem of the mixed boundary question for the hyperbolic equation with alternating coefficients. It is proved that in the case of rather great values of $T$ there exists a control which brings the system to a rest. 
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G. Idris. On the control problem for hyperbolic general equations. Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 2 (1991), pp. 53-63. http://geodesic.mathdoc.fr/item/UZERU_1991_2_a6/

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