Shah, G. M. “Monotonic Variation of the Zeros of Stieltjes and Van Vleck Polynomials”. The Journal of the Indian Mathematical Society 33, no. 2-4 (December 1, 1969): 85–92. Accessed May 7, 2024. https://www.informaticsjournals.com/index.php/jims/article/view/16748.