@article{MZM_1988_44_6_a1,
     author = {V. S. Balaganskii},
     title = {Frechet differentiability of the distance function and the structure of sets},
     journal = {Matemati\v{c}eskie zametki},
     pages = {725--734},
     publisher = {mathdoc},
     volume = {44},
     number = {6},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1988_44_6_a1/}
}