Mazhitova, A. D. “Sub-Riemannian Problem on the Three-Dimensional Solvable Lie Group SOLV + With Right-Invariant Distribution”. Journal of Mathematics, Mechanics and Computer Science 77, no. 2 (June 30, 2013): 43–51. Accessed July 3, 2024. https://bm.kaznu.kz/index.php/kaznu/article/view/94.