Anburajan, P., and A. R. S. Ramaswamy. “A Two Stage Group Acceptance Sampling Plans Based on Truncated Life Tests Using Log-Logistic and Gamma Distributions”. Journal of Progressive Research in Mathematics, Vol. 2, no. 2, Mar. 2015, pp. 107-1, https://scitecresearch.com/journals/index.php/jprm/article/view/44.