Eftekharian, Abbas, Mostafa Razmkhah, and Jafar Ahmadi. “A Flexible Ranked Set Sampling Schemes: Statistical Analysis on Scale Parameter”. Statistics, Optimization & Information Computing 9, no. 1 (July 1, 2020): 189-203. Accessed April 15, 2021. http://iapress.org/index.php/soic/article/view/812.