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@article{PORMA_1994__51_4_47318, author = {Apolaya, Ricardo Fuentes}, title = {Exact controllability for temporally wave equation.}, journal = {Portugaliae mathematica}, pages = {475--488}, publisher = {mathdoc}, volume = {51}, number = {4}, year = {1994}, zbl = {0828.49008}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1994__51_4_47318/} }
Apolaya, Ricardo Fuentes. Exact controllability for temporally wave equation.. Portugaliae mathematica, Tome 51 (1994) no. 4, pp. 475-488. http://geodesic.mathdoc.fr/item/PORMA_1994__51_4_47318/