%0 Journal Article %A Nguyen Huu Tho %A Tran Duc Van %T Hopf-type estimates for solutions to Hamilton-Jacobi equations with concave-convex initial data %J Electronic Journal of Differential Equations %D 2003 %V 2003 %I mathdoc %U http://geodesic.mathdoc.fr/item/EJDE_2003__2003__a140/ %G en %F EJDE_2003__2003__a140