Ritthirak, Kanchanarak, Pawinee Saensuk, and Klairung Samart. “Comparison of regression coefficient estimates of linear mixed model on missing longitudinal data”. KKU Science Journal 48, no. 2 (November 28, 2022): 183–191. accessed April 10, 2025. https://ph01.tci-thaijo.org/index.php/KKUSciJ/article/view/250090.