BOLSHEV, L.; KRUOPIS, J. On the modelling of the epidemic processes. Lithuanian Mathematical Journal, [S. l.], v. 9, n. 2, p. 243–253, 1969. DOI: 10.15388/LMJ.1969.20751. Disponível em: https://www.zurnalai.vu.lt/LMJ/article/view/20751. Acesso em: 8 jun. 2025.