S. V. Konyagin and I. D. Shkredov, “On one result of J. Bourgain”, Ukr. Mat. Zhurn., vol. 62, no. 3, pp. 332–368, Mar. 2010, Accessed: Apr. 16, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/2872