MathSciNet bibliographic data MR1108480 35L20 (35B65) Lasiecka, I.; Triggiani, R. Sharp regularity theory for second order hyperbolic equations of Neumann type. I. \$L\sb 2\$$L\sb 2$ nonhomogeneous data. Ann. Mat. Pura Appl. (4) 157 (1990), 285–367. Article

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