@article{RLINA_1989_8_83_1_a17,
     author = {Lasiecka, Irena and Triggiani, Roberto},
     title = {Sharp regularity theory for second order hyperbolic equations of {Neumann} type},
     journal = {Atti della Accademia nazionale dei Lincei. Rendiconti della Classe di scienze fisiche, matematiche e naturali},
     pages = {109--113},
     publisher = {mathdoc},
     volume = {Ser. 8, 83},
     number = {1},
     year = {1989},
     zbl = {0767.35043},
     mrnumber = {1142447},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RLINA_1989_8_83_1_a17/}
}