no. 1
Hidden regularity for semilinear hyperbolic partial differential equations
Annales de la Faculté des sciences de Toulouse : Mathématiques, Série 5, Tome 9 (1988) no. 1, pp. 103-120 
@article{AFST_1988_5_9_1_103_0,
     author = {Milla Miranda, M. and Medeiros, L.A.},
     title = {Hidden regularity for semilinear hyperbolic partial differential equations},
     journal = {Annales de la Facult\'e des sciences de Toulouse : Math\'ematiques},
     pages = {103--120},
     year = {1988},
     publisher = {Universit\'e Paul Sabatier},
     address = {Toulouse},
     volume = {Ser. 5, 9},
     number = {1},
     mrnumber = {971816},
     zbl = {0618.35073},
     language = {en},
     url = {https://www.numdam.org/item/AFST_1988_5_9_1_103_0/}
}
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Milla Miranda, M.; Medeiros, L.A. Hidden regularity for semilinear hyperbolic partial differential equations. Annales de la Faculté des sciences de Toulouse : Mathématiques, Série 5, Tome 9 (1988) no. 1, pp. 103-120. https://www.numdam.org/item/AFST_1988_5_9_1_103_0/

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