Lengerov, Angel, Silviya Salapateva, and Georgi Levicharov. “IMPROVEMENT OF TECHNOLOGICAL PROCESSES TO REDUCE TOTAL INACCURACY DURING BORING DEEP HOLES”. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference 3 (June 22, 2024): 158–161. Accessed November 23, 2024. https://journals.ru.lv/index.php/ETR/article/view/8127.