@article{10_4064_cm_43_1_111_116,
     author = {Ryszard Smarzewski},
     title = {On characterization of non-linear best {Chebyshev} approximations},
     journal = {Colloquium Mathematicum},
     pages = {111--116},
     publisher = {mathdoc},
     volume = {43},
     number = {1},
     year = {1980},
     doi = {10.4064/cm-43-1-111-116},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-43-1-111-116/}
}