Ramadhan, Ilham Febri. “METODE PSEUDOSPEKTRAL CHEBYSHEV PADA APROKSIMASI TURUNAN FUNGSI”. Jurnal Matematika UNAND 6, no. 1 (February 1, 2017): 50–57. Accessed November 4, 2026. https://jmua.fmipa.unand.ac.id/index.php/jmua/article/view/254.