%0 Journal Article %A Taylor, W.E. jr. %T On the oscillation of a fourth order differential equation and its adjoint %J Portugaliae mathematica %D 1978 %P 299-305 %V 37 %N 3-4 %I mathdoc %U http://geodesic.mathdoc.fr/item/PORMA_1978__37_3-4_115359/ %G en %F PORMA_1978__37_3-4_115359