@article{10_4064_cm123_2_5,
     author = {Horst Martini and Zokhrab Mustafaev},
     title = {Estimates on inner and outer radii of unit balls in normed spaces},
     journal = {Colloquium Mathematicum},
     pages = {211--217},
     publisher = {mathdoc},
     volume = {123},
     number = {2},
     year = {2011},
     doi = {10.4064/cm123-2-5},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm123-2-5/}
}