@article{10_4064_sm_40_1_91_108,
     author = {A. Pe{\l}czy\'nski and P. Wojtaszczyk},
     title = {Banach spaces with finite dimensional expansions of identity and universal bases of finite dimensional subspaces},
     journal = {Studia Mathematica},
     pages = {91--108},
     year = {1971},
     volume = {40},
     number = {1},
     doi = {10.4064/sm-40-1-91-108},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-40-1-91-108/}
}