On the regularity of boundary traces for the wave equation
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 26 (1998) no. 1, pp. 185-206. 
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     author = {Tataru, Daniel},
     title = {On the regularity of boundary traces for the wave equation},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {185--206},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 26},
     number = {1},
     year = {1998},
     mrnumber = {1633000},
     zbl = {0932.35136},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1998_4_26_1_185_0/}
}
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Tataru, Daniel. On the regularity of boundary traces for the wave equation. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 26 (1998) no. 1, pp. 185-206. http://www.numdam.org/item/ASNSP_1998_4_26_1_185_0/

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