Farahi, Mohammad Hussain, and Jawid Hashimi. 2025. “Second Order Linear Homogeneous Equations With Constant Coefficients”. Farah Research and Scientific Journal 2 (1). Sayed Barakat, Ahmad Alami. (2017). Challenges of quality assurance in higher education: Case study of Afghanistan. Journal of Education and Practice, 8(12), 34-45.:205-14. https://frsj.farau.edu.af/index.php/frsj/article/view/64.