خليل إبراهيم سندس. “Hiding Text Data in Karhunen Loeve Space by Using a Random Formula in Digital Images”. IRAQI JOURNAL OF STATISTICAL SCIENCES 11, no. 2 (December 1, 2011): 786–800. Accessed September 5, 2025. https://ojs.uomosul.edu.iq/index.php/stats/article/view/29377.