TIEŠIS , Vytautas. The sufficient prevention level in the model of epidemic . Lietuvos matematikos rinkinys, [S. l.], v. 37, n. I, p. 317–323 , 1997. DOI: 10.15388/LMD.1997.38249. Disponível em: https://journals.vu.lt./LMR/article/view/38249. Acesso em: 19 apr. 2025.