%0 Journal Article %A Sternberg, Robert L. %T Applications of the theory of systems of differential equations to vibrating beams %J Portugaliae mathematica %D 1954 %P 111-120 %V 13 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/PORMA_1954__13_3_114736/ %G en %F PORMA_1954__13_3_114736