Anburajan, Priyah, and A. R. Sudamani Ramaswamy. 2015. “A Hybrid Group Acceptance Sampling Plan for Lifetimes Based on Gamma, Exponentiated Log - Logistic and Marshall - Olkin Extended Exponential Distributions”. Journal of Progressive Research in Mathematics 2 (1), 57-68. http://scitecresearch.com/journals/index.php/jprm/article/view/35.