Shirvanyan, N. V., and V. L. Shirvanyan. “ON PRESENTATIONS OF THE GROUP 7.7 FROM KOUROV NOTEBOOK”. Proceedings of the YSU A: Physical and Mathematical Sciences 39, no. 3 (208) (October 20, 2005): 141–142. Accessed November 23, 2024. https://journals.ysu.am/index.php/proceedings-phys-math/article/view/vol39_no3_2005_pp141-142.