Fishchenko, Iakiv V., and Lyudmyla D. Kravchuk. “Biportal Endoscopic Spinal Surgery for Lumbar Spinal Stenosis”. Ukrainian Neurosurgical Journal 26, no. 1 (March 12, 2020): 13–19. Accessed April 8, 2025. https://theunj.org/article/view/187535.