Kamińska, A., I. Krasikova, and M. Popov. “Projection Lateral Bands and Lateral Retracts”. Carpathian Mathematical Publications 12, no. 2 (December 6, 2020): 333–339. Accessed April 18, 2024. https://journals.pnu.edu.ua/index.php/cmp/article/view/4145.