Mahadesyawardani, Arinda, et al. “Comparative Analysis of Local Polynomial Regression and ARIMA in Predicting Indonesian Benchmark Coal Price”. PYTHAGORAS Jurnal Matematika Dan Pendidikan Matematika, vol. 19, no. 1, Nov. 2024, pp. 64-76, doi:10.21831/pythagoras.v19i1.74889.