%0 Journal Article %A M.A. Vivaldi %A Maria G. Garroni %T Bilateral Evolution Problems of Non-Variational Type: Existence, Uniqueness, Hölder-Regularity and Approximation of Solutions. %J Manuscripta mathematica %D 1984 %P 39-70 %V 48 %I mathdoc %U http://geodesic.mathdoc.fr/item/MM2_1984__48_155019/ %F MM2_1984__48_155019