%0 Journal Article
%A D'Ancona, Piero
%T Well posedness in $C^\infty $ for a weakly hyperbolic second order equation
%J Rendiconti del Seminario Matematico della Università di Padova
%D 1994
%P 65-83
%V 91
%I Seminario Matematico of the University of Padua
%U http://www.numdam.org/item/RSMUP_1994__91__65_0/
%G en
%F RSMUP_1994__91__65_0