@article{ZNSL_2016_443_a8,
     author = {V. S. Kalnitsky},
     title = {Symmetries of a~flat cosymbol algebra of the differential operators},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {95--105},
     year = {2016},
     volume = {443},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2016_443_a8/}
}