Jiamwattanapong, Knavoot, Nisand Ingadapa, and Bandhita Plubin. “On Testing Homogeneity of Covariance Matrices With Box’s M and the Approximate Tests for Multivariate Data”. European Journal of Applied Sciences 9, no. 5 (November 7, 2021): 426–436. Accessed May 8, 2024. https://journals.scholarpublishing.org/index.php/AIVP/article/view/11115.