Victorbabu, Bejjam Re, and Chandaluri V.V.S. Surekha. “Measure of rotatability for second order response surface designs using a pair of partially balanced incomplete block designs”. Thailand Statistician 12, no. 2 (May 27, 2015): 179–189. accessed September 24, 2026. https://ph02.tci-thaijo.org/index.php/thaistat/article/view/34197.