Influential diagnostics with Pena's statistic for the modified ridge regression. - Muhammad Kashif; Muhammad Aman Ullah; Muhammad Aslam (Commun. Stat. Simul. Comput., 2021)

Evaluating the Impact of Institutional Improvement on Control of Corruption - A System Dynamics Approach. - Ivan W. Taylor; Muhammad Aman Ullah; Saroj Koul; Mark Sandoval Ulloa (Syst., 2022)