The deterministic model with time delay for a new product diffusion in a market. Timisoara Journal of Economics and Business, [S. l.], v. 11, n. 1, p. 55–66, 2019. Disponível em: https://www.tjeb.ro/index.php/tjeb/article/view/TJEB-vol11-2018-iss1-art4-SIRGHI. Acesso em: 11 jul. 2025.