Jiratchayut, Kanyalin, and Chinnaphong Bumrungsup. “Penalized Linear Regression Methods where the Predictors Have Grouping Effect”. Thailand Statistician 17, no. 2 (July 10, 2019): 212–222. accessed September 28, 2026. https://ph02.tci-thaijo.org/index.php/thaistat/article/view/202296.