Boyko, Vyacheslav M.; Lokaziuk, Oleksandra V.; Popovych, Roman O. Admissible transformations and Lie symmetries of linear systems of second-order ordinary differential equations. (English) Zbl 07905808 J. Math. Anal. Appl. 539, No. 2, Article ID 128543, 51 p. (2024). MSC: 17B80 34C14 × Cite Format Result Cite Review PDF Full Text: DOI arXiv
Popovych, Roman O. Point and contact equivalence groupoids of two-dimensional quasilinear hyperbolic equations. (English) Zbl 1462.35021 Appl. Math. Lett. 116, Article ID 107068, 8 p. (2021). MSC: 35B06 35L72 × Cite Format Result Cite Review PDF Full Text: DOI arXiv