Bandura, A.I., S.I. Dubei, T.M. Salo, and O.B. Skaskiv. “Entire Functions of Several Variables: Behaviour of Directional Derivatives”. Carpathian Mathematical Publications 18, no. 1 (March 24, 2026): 67–77. Accessed July 27, 2026. https://journals.pnu.edu.ua/index.php/cmp/article/view/9835.