A. D. . Roitgarts, “Limiting theorems for point random fields preset on the plane”, Ukr. Mat. Zhurn., vol. 43, no. 1, pp. 118–121, Jan. 1991, Accessed: Feb. 17, 2026. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/9315