Global solution of the wave equation
Journées équations aux dérivées partielles (1990), article no. 18, 9 p. 
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     publisher = {Ecole polytechnique},
     year = {1990},
     mrnumber = {91j:58161},
     zbl = {0719.58041},
     language = {en},
     url = {http://archive.numdam.org/item/JEDP_1990____A18_0/}
}
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Laptev, Ari; Safarov, Yu. Global solution of the wave equation. Journées équations aux dérivées partielles (1990), article  no. 18, 9 p. http://archive.numdam.org/item/JEDP_1990____A18_0/

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