@article{IM2_1993_41_2_a5,
     author = {A. N. Kochubei},
     title = {The differentiation operator on subsets of the field of $p$-adic numbers},
     journal = {Izvestiya. Mathematics },
     pages = {289--305},
     publisher = {mathdoc},
     volume = {41},
     number = {2},
     year = {1993},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1993_41_2_a5/}
}