Zahid Khan, Amina Shahzadi, Ammara Nawaz Cheema, Bashir ul Haq, and Maria Malik. “An Efficient Modified Ratio Estimator under Stratified Ranked Set Sampling ”. Metallurgical and Materials Engineering 30, no. 4 (December 14, 2024): 677–686. Accessed September 13, 2026. https://metall-mater-eng.com/index.php/home/article/view/1497.