Geodesic
Symmetries of a~flat cosymbol algebra of the differential operators
Zapiski Nauchnykh Seminarov POMI, Problems in the theory of representations of algebras and groups. Part 29, Tome 443 (2016), pp. 95-105

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In this paper the structure theorem is proved for graded symmetries of a flat cosymbol algebra. This theorem together with Equivariant Polynomials Lemma gives an upper bound on the grade dimensions of the Lie algebra of symmetries. 
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     author = {V. S. Kalnitsky},
     title = {Symmetries of a~flat cosymbol algebra of the differential operators},
     journal = {Zapiski Nauchnykh Seminarov POMI},
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     year = {2016},
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     url = {http://geodesic.mathdoc.fr/item/ZNSL_2016_443_a8/}
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V. S. Kalnitsky. Symmetries of a~flat cosymbol algebra of the differential operators. Zapiski Nauchnykh Seminarov POMI, Problems in the theory of representations of algebras and groups. Part 29, Tome 443 (2016), pp. 95-105. http://geodesic.mathdoc.fr/item/ZNSL_2016_443_a8/