@article{MMO_2018_79_2_a1,
     author = {N. E. Tokmagambetov and B. T. Torebek},
     title = {Symmetric differential operators of fractional order and their extensions},
     journal = {Trudy Moskovskogo matemati\v{c}eskogo ob\^{s}estva},
     pages = {209--219},
     publisher = {mathdoc},
     volume = {79},
     number = {2},
     year = {2018},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MMO_2018_79_2_a1/}
}