no. 4
The Cauchy problem for non linear wave equations in domains with moving boundary
Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 3, Tome 26 (1972) no. 4, pp. 829-838 
@article{ASNSP_1972_3_26_4_829_0,
     author = {Cooper, Jeffery and Medeiros, Luiz A.},
     title = {The {Cauchy} problem for non linear wave equations in domains with moving boundary},
     journal = {Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche},
     pages = {829--838},
     year = {1972},
     publisher = {Scuola normale superiore},
     volume = {Ser. 3, 26},
     number = {4},
     mrnumber = {367459},
     zbl = {0248.35076},
     language = {en},
     url = {https://www.numdam.org/item/ASNSP_1972_3_26_4_829_0/}
}
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Cooper, Jeffery; Medeiros, Luiz A. The Cauchy problem for non linear wave equations in domains with moving boundary. Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 3, Tome 26 (1972) no. 4, pp. 829-838. https://www.numdam.org/item/ASNSP_1972_3_26_4_829_0/

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[3] Lions, J.L. - Quelques méthodes de résolution des problèmes aux limites non lineaires, Dnmod, Paris, 1969. | Zbl | MR

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