%0 Journal Article %A Wells, James %T On the Zeros of Functions with Derivatives in H 1 and H ∞ %J Canadian journal of mathematics %D 1970 %P 342-347 %V 22 %N 2 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1970-042-x/ %R 10.4153/CJM-1970-042-x %F 10_4153_CJM_1970_042_x