Thonglor, O., C. E. Reano, and C. E. Reano. “Appropriate Covariance Structure for Linear Mixed Model in the Animal Experiments with Repeated Measurement Data”. Thailand Statistician, vol. 20, no. 4, Sept. 2022, pp. 812-26, https://ph02.tci-thaijo.org/index.php/thaistat/article/view/247462.