Titaley, J., T. Manurung, and H. D. Titaley. “CUBIC AND QUADRATIC POLYNOMIAL ON JULIA SET WITH TRIGONOMETRIC FUNCTION”. Jurnal Ilmiah Sains, vol. 18, no. 2, Nov. 2018, pp. 103-6, doi:10.35799/jis.18.2.2018.21555.