Ngo, T. T. N. (2026) “A new approach to the index of differential-algebraic equations based on the index of matrix pencil”, Thang Long Journal of Science: Mathematics and Mathematical Sciences, 5(1), pp. 21–40. Available at: https://science.thanglong.edu.vn/index.php/volc/article/view/295 (Accessed: 21 September 2026).