%0 Journal Article %A David Grow %A Matt Insall %T An extremal set of uniqueness? %J Colloquium Mathematicum %D 1993 %P 61-64 %V 65 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm-65-1-61-64/ %R 10.4064/cm-65-1-61-64 %G en %F 10_4064_cm_65_1_61_64