@article{VMUMM_2008_5_a7,
     author = {A. R. Alimov},
     title = {Preservation of approximative properties of {Chebyshev} sets and suns in a plane},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {46--49},
     publisher = {mathdoc},
     number = {5},
     year = {2008},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2008_5_a7/}
}