@article{TIMM_1992_1_a5,
     author = {V. S. Balaganskii},
     title = {Sufficient conditions of the metric function of differentiability},
     journal = {Trudy Instituta matematiki i mehaniki},
     pages = {84--89},
     publisher = {mathdoc},
     volume = {1},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TIMM_1992_1_a5/}
}