@article{10_4064_cm_42_1_33_37,
     author = {Karol Borsuk and Rimas Vaina},
     title = {On covering of bounded sets by sets with the twice less diameter},
     journal = {Colloquium Mathematicum},
     pages = {33--37},
     publisher = {mathdoc},
     volume = {42},
     number = {1},
     year = {1979},
     doi = {10.4064/cm-42-1-33-37},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-42-1-33-37/}
}