Oja, Hannu, Seija Sirkiä, and Jan Eriksson. “Scatter Matrices and Independent Component Analysis”. Austrian Journal of Statistics 35, no. 2&3 (April 3, 2016): 175–189. Accessed January 31, 2023. https://www.ajs.or.at/index.php/ajs/article/view/vol35%2C%20no2%263%20-%207.