%0 Journal Article %A Cheng, Sui-Sun %T Sturmian theorems for components of coupled elliptic systems %J Portugaliae mathematica %D 1979 %P 113-117 %V 38 %N 1-2 %I mathdoc %U http://geodesic.mathdoc.fr/item/PORMA_1979__38_1-2_115372/ %G en %F PORMA_1979__38_1-2_115372