%0 Journal Article %A Olavi Nevanlinna %T Resolvent conditions and powers of operators %J Studia Mathematica %D 2001 %P 113-134 %V 145 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm145-2-2/ %R 10.4064/sm145-2-2 %G en %F 10_4064_sm145_2_2