TY - JOUR AU - B. L. Lin AU - I. Singer TI - On conditional bases of \(\ell^2\) JO - Commentationes Mathematicae PY - 1971 SP - 135 EP - 139 VL - 15 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.14708/cm.v15i1.5713/ DO - 10.14708/cm.v15i1.5713 LA - pl ID - 10_14708_cm_v15i1_5713 ER -