%0 Journal Article %A Wojciech Chojnacki %T On operator-valued cosine sequences on UMD spaces %J Studia Mathematica %D 2010 %P 267-278 %V 199 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm199-3-4/ %R 10.4064/sm199-3-4 %G en %F 10_4064_sm199_3_4