Irfan, Muhammad, Farukh Zunaira, Maria Javed, Sandile C. Shongwe, Sajjad Haider Bhatti, and Muhammad Ali Hussain. “Advancements in Population Mean Estimation for Circular Systematic Sampling”. Contemporary Mathematics 6, no. 4 (August 15, 2025): 5053–5072. Accessed December 15, 2025. https://ojs.wiserpub.com/index.php/CM/article/view/7140.