Thongkum, Danupon, Songmuang Laotrakool, and Wuttichai Srisodaphol. 2017. “Confidence Intervals for the Mean of Lognormal Distribution With Application”. Asia-Pacific Journal of Science and Technology 18 (3):501-10. https://so01.tci-thaijo.org/index.php/APST/article/view/82876.