DENYSIA, Denysia; HIDAYAT, Rahmat. 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, [S. l.], v. 8, n. 4, p. 1333–1344, 2023. DOI: 10.31943/mathline.v8i4.499. Disponível em: https://mathline.unwir.ac.id/index.php/Mathline/article/view/499. Acesso em: 24 dec. 2025.