@article{AA_2013_25_3_a7,
     author = {N. A. Shirokov},
     title = {Sufficient condition for {H\"older} smoothness of a~function},
     journal = {Algebra i analiz},
     pages = {200--206},
     publisher = {mathdoc},
     volume = {25},
     number = {3},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_2013_25_3_a7/}
}