Boundary controllability in problems of transmission for a class of second order hyperbolic systems
ESAIM: Control, Optimisation and Calculus of Variations, Volume 2  (1997), p. 343-357 
@article{COCV_1997__2__343_0,
     author = {Lagnese, John E.},
     title = {Boundary controllability in problems of transmission for a class of second order hyperbolic systems},
     journal = {ESAIM: Control, Optimisation and Calculus of Variations},
     publisher = {EDP-Sciences},
     volume = {2},
     year = {1997},
     pages = {343-357},
     zbl = {0899.93003},
     mrnumber = {1487483},
     language = {en},
     url = {http://www.numdam.org/item/COCV_1997__2__343_0}
}

Lagnese, John E. Boundary controllability in problems of transmission for a class of second order hyperbolic systems. ESAIM: Control, Optimisation and Calculus of Variations, Volume 2 (1997) , pp. 343-357. http://www.numdam.org/item/COCV_1997__2__343_0/

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