%0 Journal Article
%A G.B. Gustafson
%T An integral equation for perturbed nonlinear functional differential equations, with applications to periodic solutions and nonlinear boundary value problems.
%J Journal für die reine und angewandte Mathematik
%D 1974
%P 35-62
%V 271
%I mathdoc
%U http://geodesic.mathdoc.fr/item/JRAM_1974__271_151505/
%F JRAM_1974__271_151505