Tran, Minh Nguyet, Thi Loan Nguyen, Thi Van Nguyen, and Truong Xuan Pham. “On Certain Classes of Mild Solutions of the Scalar Liénard Equation Revisited”. Thang Long Journal of Science: Mathematics and Mathematical Sciences 3, no. 2 (n.d.). Accessed December 12, 2024. https://science.thanglong.edu.vn/index.php/volc/article/view/166.