%0 Journal Article %A Wojciech Chojnacki %T On group decompositions of bounded cosine sequences %J Studia Mathematica %D 2007 %P 61-85 %V 181 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm181-1-5/ %R 10.4064/sm181-1-5 %G en %F 10_4064_sm181_1_5