%0 Journal Article %A Russell C. Thompson %T On extremal solutions to infinite dimensional non-linear second order systems %J Annales Polonici Mathematici %D 1983 %P 73-88 %V 41 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ap-41-1-73-88/ %R 10.4064/ap-41-1-73-88 %G en %F 10_4064_ap_41_1_73_88