Vaskouski, Maksim M., Maksim A. Firsau, and Palina D. Babayeva. 2025. “A Generalisation of the Steiner – Lehmus Theorem and Critical Values Transcendence of Its Parameters”. Journal of the Belarusian State University. Mathematics and Informatics, no. 2 (November): 42-61. https://doi.org/10.33581/2520-6508-2025-2-42-61.