@article{TRSPY_1985_172_a4,
     author = {Ya. S. Bugrov},
     title = {Fractional difference operators and function classes},
     journal = {Informatics and Automation},
     pages = {60--70},
     publisher = {mathdoc},
     volume = {172},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1985_172_a4/}
}