Nazrina Aziz, Zakiyah Zain, Aiman Fikri Jamaludin, Shazlyn Milleana Shaharudin. “Performance Comparison of Group Chain Sampling Plan and Modified Group Chain Sampling Plan Based on Mean Product Lifetime for Rayleigh Distribution”. International Journal of Advanced Science and Technology, Vol. 29, no. 06, Apr. 2020, pp. 463 -71, http://sersc.org/journals/index.php/IJAST/article/view/11471.