Bandura, A.I. “Some Weaker Sufficient Conditions of $L$-Index Boundedness in Direction for Functions Analytic in the Unit Ball”. Carpathian Mathematical Publications 11, no. 1 (June 30, 2019): 14–25. Accessed November 21, 2024. https://journals.pnu.edu.ua/index.php/cmp/article/view/1503.