“Measure of Slope Rotatability for Second Order Response Surface Designs Under Tri-Diagonal Correlation Error Structure Using Central Composite Designs: Measure of Slope Rotatability With Tri-Diagonal Error Stricture Using CCD”. Journal of the Kerala Statistical Association 31, no. 1 (December 1, 2020): 85–104. Accessed November 5, 2026. https://www.ojs.ksa.org.in/index.php/JKSA/article/view/34.