Delay differential equation of the 2nd order and it’s an oscillation yardstick. Baghdad Science Journal, Iraq, Baghdad, v. 20, n. 3(Suppl.), p. 1116, 2023. DOI: 10.21123/bsj.2023.7778. Disponível em: https://bsj.uobaghdad.edu.iq/index.php/BSJ/article/view/7778.. Acesso em: 8 may. 2024.