Geodesic
Sharp regularity theory for second order hyperbolic equations of Neumann type
Atti della Accademia nazionale dei Lincei. Rendiconti della Classe di scienze fisiche, matematiche e naturali, Série 8, Tome 83 (1989) no. 1, pp. 109-113 Cet article a éte moissonné depuis la source Biblioteca Digitale Italiana di Matematica

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This note provides sharp regularity results for general, time-independent, second order, hyperbolic equations with non-homogeneous data of Neumann type. 
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Lasiecka, Irena; Triggiani, Roberto. Sharp regularity theory for second order hyperbolic equations of Neumann type. Atti della Accademia nazionale dei Lincei. Rendiconti della Classe di scienze fisiche, matematiche e naturali, Série 8, Tome 83 (1989) no. 1, pp. 109-113. http://geodesic.mathdoc.fr/item/RLINA_1989_8_83_1_a17/

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