@incollection{MSMF_1972__31-32__395_0,
     author = {Wojtaszczyk, Przemyslaw},
     title = {Approximation properties and universal {Banach} spaces},
     booktitle = {Colloque d'analyse fonctionnelle (Bordeaux, 1971)},
     series = {Bulletin de la Soci\'et\'e math\'ematique de France. M\'emoire},
     pages = {395--398},
     year = {1972},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {31-32},
     doi = {10.24033/msmf.107},
     mrnumber = {50 #8027},
     zbl = {0243.46031},
     url = {https://www.numdam.org/articles/10.24033/msmf.107/}
}