Havrylenko, I. 2025. The Jacobi operator and the stability of vertical minimal surfaces in the sub-Riemannian Lie group SL(2,R). Visnyk of V. N. Karazin Kharkiv National University. Ser. Mathematics, Applied Mathematics and Mechanics. 102, (Dec. 2025), 30-47. DOI:https://doi.org/10.26565/2221-5646-2025-102-02.