@article{VMUMM_2001_5_a1,
     author = {A. V. Medvedev},
     title = {Existence of an infinitely differentiable concave majorant of a modulus of continuity},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {11--15},
     publisher = {mathdoc},
     number = {5},
     year = {2001},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2001_5_a1/}
}