I. Alsaif, khalil, khalil, N. salim AL-lella, and Nagham. “Studying The Noise Effect on Data Hiding Based on Contourlet Coefficients”. IRAQI JOURNAL OF STATISTICAL SCIENCES, vol. 13, no. 3, June 2025, pp. 165-80, https://rjps.uomosul.edu.iq/index.php/stats/article/view/20874.