Bronza, S. D., A. T. Kotvytskiy, and Ye. M. Korostelov. “The N-Point Gravitational Lens As Cover and His the Profile Cover”. Journal of V. N. Karazin Kharkiv National University. Series Physics0, no. 31 (December 26, 2019): 48-53. Accessed April 18, 2024. https://periodicals.karazin.ua/physics/article/view/15148.