@article{10_14708_cm_v15i1_5713,
     author = {B. L. Lin and I. Singer},
     title = {On conditional bases of \(\ell^2\)},
     journal = {Commentationes Mathematicae},
     pages = { 135--139},
     publisher = {mathdoc},
     volume = {15},
     number = {1},
     year = {1971},
     doi = {10.14708/cm.v15i1.5713},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/cm.v15i1.5713/}
}