Well posedness in C ∞ for a weakly hyperbolic second order equation
Rendiconti del Seminario Matematico della Università di Padova, Tome 91 (1994), pp. 65-83. 
@article{RSMUP_1994__91__65_0,
     author = {D'Ancona, Piero},
     title = {Well posedness in $C^\infty $ for a weakly hyperbolic second order equation},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {65--83},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {91},
     year = {1994},
     zbl = {0820.35097},
     language = {en},
     url = {http://archive.numdam.org/item/RSMUP_1994__91__65_0/}
}
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D'Ancona, Piero. Well posedness in $C^\infty $ for a weakly hyperbolic second order equation. Rendiconti del Seminario Matematico della Università di Padova, Tome 91 (1994), pp. 65-83. http://archive.numdam.org/item/RSMUP_1994__91__65_0/

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