%0 Journal Article %A Holmes, Mark H. %A Stein, F. Max %T Sturmian theory and transformations for the Riccati equation %J Portugaliae mathematica %D 1976 %P 65-73 %V 35 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/PORMA_1976__35_2_115277/ %G en %F PORMA_1976__35_2_115277