I. Alsaif, khalil, khalil, S. M.Mohi Al-Deen, and Shaimaa. “Eigen Values of Covariance Matrix for Feature Extraction of Latin Printed Image”. IRAQI JOURNAL OF STATISTICAL SCIENCES, vol. 11, no. 1, June 2025, pp. 39-48, https://rjps.uomosul.edu.iq/index.php/stats/article/view/20605.