Muhammad Reza Fahlevi, and Mohammad Andri Budiman. “Computing the Value of Pi in the Manner of Lambda Function With R Statistical Programming Language”. Data Science: Journal of Computing and Applied Informatics 5, no. 1 (February 2, 2021): 39–48. Accessed September 8, 2025. https://idjpcr.usu.ac.id/JoCAI/article/view/5556.