@article{10_4064_sm_25_1_5_25,
     author = {A. Pe{\l}czy\'nski and I. Singer},
     title = {On non-equivalent bases and conditional bases in {Banach} spaces},
     journal = {Studia Mathematica},
     pages = {5--25},
     publisher = {mathdoc},
     volume = {25},
     number = {1},
     year = {1964},
     doi = {10.4064/sm-25-1-5-25},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-25-1-5-25/}
}