OMARA, Tarek Mahmoud. Ridge and Liu-Type Estimators for Tobit SUR Model: Application to Air pollution Data. Journal of Multidisciplinary Applied Natural Science, Metro, Indonesia, v. 6, n. 2, p. 1011–1028, 2026. DOI: 10.47352/jmans.2774-3047.372. Disponível em: https://pandawainstitute.com/journal/index.php/jmans/article/view/372. Acesso em: 7 jul. 2026.