Lestari, Trianingsih, and Rike Desy Yuansa. “Response Surface Regression With LTS and MM-Estimator to Overcome Outliers on Red Roselle Flowers”. Jurnal Varian 4, no. 2 (April 30, 2021): 91 - 98. Accessed April 26, 2024. https://journal.universitasbumigora.ac.id/index.php/Varian/article/view/882.