Alvaro H. SALAS S. Analytical Solution to a Duffing Equation with Time Delay. Research Updates in Mathematics and Computer Science Vol. 4, [S. l.], p. 17–24, 2024. DOI: 10.9734/bpi/rumcs/v4/3089G. Disponível em: https://stm.bookpi.org/RUMCS-V4/article/view/14097. Acesso em: 13 jun. 2026.