E. JAGATHPRABHAV; V. DHARMAIAH. Oscillation of first order delay differential equations. Malaya Journal of Matematik, India, v. 9, n. 01, p. 124–129, 2021. Disponível em: https://www.malayajournal.org/index.php/mjm/article/view/985. Acesso em: 16 jul. 2024.