%0 Journal Article %A Carlos Lizama %A Rodrigo Ponce %T Periodic solutions of degenerate differential equations in vector-valued function spaces %J Studia Mathematica %D 2011 %P 49-63 %V 202 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm202-1-3/ %R 10.4064/sm202-1-3 %G en %F 10_4064_sm202_1_3