@article{IM2_2019_83_5_a2,
     author = {I. D. Kan},
     title = {Differentiability of the {Minkowski} function $?(x)${.~II}},
     journal = {Izvestiya. Mathematics },
     pages = {957--989},
     publisher = {mathdoc},
     volume = {83},
     number = {5},
     year = {2019},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2019_83_5_a2/}
}