Mardianto, M. F. F., R. A. Ariyanto, R. Andriawan, and D. A. Husada. “Contribution Analysis of ‘Suroboyo Bus’ in Waste Management Based on Two Form of Complete Fourier Series Estimator”. Jurnal Matematika MANTIK, vol. 7, no. 1, May 2021, pp. 86-95, doi:10.15642/mantik.2021.7.1.86-95.