@article{IM2_2018_82_1_a0,
     author = {A. G. Baskakov and V. B. Didenko},
     title = {On invertibility states of differential and difference operators},
     journal = {Izvestiya. Mathematics },
     pages = {1--13},
     publisher = {mathdoc},
     volume = {82},
     number = {1},
     year = {2018},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2018_82_1_a0/}
}