Petrov, E. and Havrylenko, I. (2023) “Stability of minimal surfaces in the sub-Riemannian manifold $\widetilde{E(2)}$”, Visnyk of V. N. Karazin Kharkiv National University. Ser. Mathematics, Applied Mathematics and Mechanics, 98, pp. 50-67. doi: 10.26565/2221-5646-2023-98-04.