FATIMA N. AHMED. Averaging Techniques in The Oscillations of Nonlinear Differential Equations With Alternating Coefficients. مجلة البيان العلمية, [S. l.], n. 14, p. 227–217, 2023. Disponível em: https://journal.su.edu.ly/index.php/bayan/article/view/1838. Acesso em: 22 2024.