@article{TRSPY_1984_170_a10,
     author = {V. S. Kryuchkov},
     title = {Differential properties of the symbol of the singular integral {Calder\'on--Zygmund} operator},
     journal = {Informatics and Automation},
     pages = {148--160},
     publisher = {mathdoc},
     volume = {170},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1984_170_a10/}
}