@article{10_4064_sm155_1_4,
     author = {Piotr Mankiewicz and Stanis{\l}aw J. Szarek},
     title = {On the geometry of proportional quotients of ${l^m_1}$},
     journal = {Studia Mathematica},
     pages = {51--66},
     year = {2003},
     volume = {155},
     number = {1},
     doi = {10.4064/sm155-1-4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm155-1-4/}
}