Nurmakhanov НБ, Karazhanov A.A. КА. Geometric design of the surface of an underground working using (2-2)-digit transformation Г2. prengpe [Internet]. 2022 Dec. 12 [cited 2024 Nov. 21];2(2):8. Available from: https://bulprengpe.enu.kz/index.php/main/article/view/83