PageHeader : Funkcialaj $\mathrm{E}\mathrm{k}\mathrm{v}\mathrm{a}\mathrm{C}\overline{\mathrm{i}}\mathrm{o}\mathrm{j}$ , 19 (1976) 27-34 Title : Time Dependent Second Order Differential Equations Title : in Hilbert Space AuthorInfo : By AuthorInfo : W. E. FITZGIBBON AuthorInfo : (University of Houston, U.S.A.) section : 1. Preh.minaries. section : 2. The equation in $L^{2}(0, \infty, H)$ . section : 3. Two point boundary value problems. section : Refierences