Wahab, Abdul, I Nyoman Budiantara, and Kartika Fitriasari. “The Estimation of Residual Variance in Nonparametric Regression”. Jurnal Matematika, Statistika dan Komputasi 17, no. 3 (May 12, 2021): 438-446. Accessed July 9, 2025. http://54.254.27.92/index.php/jmsk/article/view/13192.