A. N. Admiralova and V. V. Beniash-Kryvets, “On representation varie ties of some HNN-extensions of free groups”, Журнал Белорусского государственного университета. Математика. Информатика, no. 2, pp. 10–16, Jan. 2019, Accessed: Jul. 18, 2026. [Online]. Available: https://journals.bsu.by/index.php/mathematics/article/view/779