@article{10_14708_cm_v27i2_6204,
     author = {S. El-Helaly and T. Husain},
     title = {Unconditionality of orthogonal bases in {B0-algebras}},
     journal = {Commentationes Mathematicae},
     pages = { 237--251},
     publisher = {mathdoc},
     volume = {27},
     number = {2},
     year = {1988},
     doi = {10.14708/cm.v27i2.6204},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/cm.v27i2.6204/}
}