Geodesic
Preliminary group classification of $(2+1)$-dimensional linear ultraparabolic Kolmogorov–Fokker–Planck equations
Ufa mathematical journal, Tome 7 (2015) no. 3, pp. 38-46 Cet article a éte moissonné depuis la source Math-Net.Ru

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We make a preliminary group classification of a class of $(2+1)$-dimensional ultraparabolic equations invariant under low-dimensional solvable Lie algebras. It is shown that there exist one, six and four nonequivalent ultraparabolic equations admitting two-, three-, and four-dimensional solvable Lie algebras, respectively.
Mots-clés : ultraparabolic equation, equivalence transformation, group classification, maximal invariance algebra, solvable Lie algebra. 
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V. V. Davydovych. Preliminary group classification of $(2+1)$-dimensional linear ultraparabolic Kolmogorov–Fokker–Planck equations. Ufa mathematical journal, Tome 7 (2015) no. 3, pp. 38-46. http://geodesic.mathdoc.fr/item/UFA_2015_7_3_a4/

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