Raihen, Md Nurul, Sultana Akter, Fariha Tabassum, Farjana Jahan, and Md Nazmul Sardar. “A Statistical Analysis of Positive Excess Mortality at Covid-19 in 2020-2021”. Journal of Mathematics and Statistics Studies 4, no. 3 (August 3, 2023): 07–17. Accessed November 30, 2025. https://al-kindipublishers.org/index.php/jmss/article/view/5645.