KHAVANIN, Mohammad. The Method of Mixed Monotony and First Order Delay Differential Equations. Pro Mathematica, [S. l.], v. 26, n. 51-52, p. 87–96, 2012. Disponível em: https://revistas.pucp.edu.pe/index.php/promathematica/article/view/8538. Acesso em: 16 dec. 2025.