@article{CMUC_1993_34_1_a4,
     author = {Bana\'s, J\'ozef and Fraczek, Krzysztof},
     title = {Deformation of {Banach} spaces},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {47--53},
     year = {1993},
     volume = {34},
     number = {1},
     mrnumber = {1240202},
     zbl = {0817.46016},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1993_34_1_a4/}
}