Y. D. Plotkin and A. F. Turbin, “Bessel $G$-Functions. I”, Ukr. Mat. Zhurn., vol. 53, no. 12, pp. 1686–1696, Dec. 2001, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/4387