@article{DAN_1958_123_3_a1,
     author = {V. A. Ditkin},
     title = {On the theory of operational calculus},
     journal = {Doklady Akademii Nauk},
     pages = {395--396},
     publisher = {mathdoc},
     volume = {123},
     number = {3},
     year = {1958},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1958_123_3_a1/}
}