Saleem, M. U. ., Farman, . M. . and Meraj, M. A. (2017) “Stability Analysis of Sorensen’s Model for Controllability and Observability: Stability Analysis of Sorensen’s Model”, Proceedings of the Pakistan Academy of Sciences: B. Life and Environmental Sciences, 54(2), pp. 133–145. Available at: http://ppaspk.org/index.php/PPAS-B/article/view/391 (Accessed: 12 March 2025).