%0 Journal Article %A Tohru Ozawa %A Y. Tsutsumi %A K. Tsutaya %T Global existence and asymptotic behavior of solutions for the Klein-Gordon equations with quadratic nonlinearity in two space dimensions. %J Mathematische Zeitschrift %D 1996 %P 341-362 %V 222 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZ_1996__222_3_174888/ %F MZ_1996__222_3_174888