@article{CMFD_2010_37_a5,
     author = {S. N. Samborskii},
     title = {Nonsmooth differentiation as an operator},
     journal = {Contemporary Mathematics. Fundamental Directions},
     pages = {70--82},
     publisher = {mathdoc},
     volume = {37},
     year = {2010},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CMFD_2010_37_a5/}
}