%0 Journal Article %A Henry Helson %T The differential equation of an inner function %J Studia Mathematica %D 1970 %P 311-321 %V 35 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm-35-3-311-321/ %R 10.4064/sm-35-3-311-321 %G en %F 10_4064_sm_35_3_311_321