The wave equation with oscillating density : observability at low frequency
ESAIM: Control, Optimisation and Calculus of Variations, Volume 5 (2000), pp. 219-258.
@article{COCV_2000__5__219_0,
     author = {Lebeau, Gilles},
     title = {The wave equation with oscillating density : observability at low frequency},
     journal = {ESAIM: Control, Optimisation and Calculus of Variations},
     pages = {219--258},
     publisher = {EDP-Sciences},
     volume = {5},
     year = {2000},
     mrnumber = {1750616},
     zbl = {0953.35083},
     language = {en},
     url = {http://www.numdam.org/item/COCV_2000__5__219_0/}
}
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Lebeau, Gilles. The wave equation with oscillating density : observability at low frequency. ESAIM: Control, Optimisation and Calculus of Variations, Volume 5 (2000), pp. 219-258. http://www.numdam.org/item/COCV_2000__5__219_0/

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