Siregar, Naufal Ramadhan Al Akhwal, Farida Farida, Sabrina Falasifah, Muhammad Falah El Fahmi, and Nur Chamidah. 2022. “Pemodelan Harga Minyak Mentah Dunia Berdasarkan Efek Pandemi Covid-19 Dengan Estimator Penalized Spline”. MUST: Journal of Mathematics Education, Science and Technology 7 (2):152-66. https://doi.org/10.30651/must.v7i2.16377.