Ando, Shuji. “A Bivariate Index Vector to Measure Departure from Quasi-Symmetry for Ordinal Square Contingency Tables”. Austrian Journal of Statistics 50, no. 5 (August 25, 2021): 115–126. Accessed October 7, 2025. https://www.ajs.or.at/index.php/ajs/article/view/1206.