Callas, N. P., and W. J. Thron. “Singular Points of Certain Functions Represented by C-Fractions”. The Journal of the Indian Mathematical Society 32, no. 1-2 (June 1, 1968): 325–353. Accessed November 7, 2024. https://informaticsjournals.co.in/index.php/jims/article/view/16780.