@article{SM_2019_210_8_a3,
     author = {I. D. Kan},
     title = {Differentiability of the {Minkowski} $?(x)${-function.~III}},
     journal = {Sbornik. Mathematics},
     pages = {1148--1178},
     publisher = {mathdoc},
     volume = {210},
     number = {8},
     year = {2019},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2019_210_8_a3/}
}