Rajyalakshmi, K., and B. R. Victorbabu. “Construction of Second Order Slope Rotatable Designs under Tri-Diagonal Correlated Structure of Errors Using Balanced Incomplete Block Designs”. Thailand Statistician, vol. 17, no. 1, Dec. 2018, pp. 104-17, https://ph02.tci-thaijo.org/index.php/thaistat/article/view/163220.