@article{NUMA_1963__5_131555,
     author = {G. AUMANN},
     title = {\"Uber den {Vergleichsfaktor} bei linearen {Approximationsproblemen.}},
     journal = {Numerische Mathematik},
     pages = {68--72},
     publisher = {mathdoc},
     volume = {5},
     year = {1963},
     zbl = {0107.11603},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1963__5_131555/}
}