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- Valentin Lychagin, Valeriy Yumaguzhin, “On structure of linear differential operators, acting on line bundles”, Journal of Geometry and Physics, 148, 2020, 103549
- P. Bibikov, “On affine classification of functions and foliations on the plane”, Lobachevskii J Math, 33, no. 2, 2012, 115
- Valentin Lychagin, Valeriy Yumaguzhin, “On invariants and equivalence of differential operators under Lie pseudogroups actions”, Journal of Geometry and Physics, 189, 2023, 104839
- Valentin Lychagin, Michael Roop, Groups, Invariants, Integrals, and Mathematical Physics, 2023, 1