“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, vol. 31, no. 1, Dec. 2020, pp. 85-104,
https://ojs.ksa.org.in/index.php/JKSA/article/view/34.