Srinivasan, B. R., and A. Sampath. “An Elementary Proof of the Prime Number Theorem With a Remainder Term”. The Journal of the Indian Mathematical Society 53, no. 1-4 (December 1, 1988): 1–50. Accessed May 4, 2024. http://informaticsjournals.com/index.php/jims/article/view/21939.