@article{SM_1982_42_4_a0,
     author = {A. D. Gadzhiev},
     title = {On differentiability properties of the symbol of a~multidimensional singular integral operator},
     journal = {Sbornik. Mathematics},
     pages = {427--450},
     publisher = {mathdoc},
     volume = {42},
     number = {4},
     year = {1982},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1982_42_4_a0/}
}