%0 Journal Article %A A. Pełczyński %A I. Singer %T On non-equivalent bases and conditional bases in Banach spaces %J Studia Mathematica %D 1964 %P 5-25 %V 25 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm-25-1-5-25/ %R 10.4064/sm-25-1-5-25 %G en %F 10_4064_sm_25_1_5_25