@article{DAN_1981_260_4_a8,
     author = {V. D. Stepanov},
     title = {On characteristic properties of integral convolution operators},
     journal = {Doklady Akademii Nauk},
     pages = {806--808},
     publisher = {mathdoc},
     volume = {260},
     number = {4},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1981_260_4_a8/}
}