BULA, I.; VINTERE, A. On the population model with a sine function. Mathematical Modelling and Analysis, [S. l.], v. 11, n. 1, p. 35–40, 2006. DOI: 10.3846/13926292.2006.9637300. Disponível em: https://journals.vilniustech.lt/index.php/MMA/article/view/9595. Acesso em: 27 jun. 2025.