%0 Journal Article %A Greenspan, Donald %T On a nine point method for the numerical evaluation of the Stokes stream function %J Portugaliae mathematica %D 1958 %P 97-106 %V 17 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/PORMA_1958__17_3_114804/ %G en %F PORMA_1958__17_3_114804