Denysia, D., & Hidayat, R. (2023). Modeling The Impact Analysis of The Covid-19 Pandemic On The Tourism Sector In Palopo City With A Nonparametric Regression Approach. Mathline : Jurnal Matematika Dan Pendidikan Matematika, 8(4), 1333–1344. https://doi.org/10.31943/mathline.v8i4.499