رمضان مطر ظافر. “Principle Components Approach Employment to Estimate the Delay Time in Dynamical Systems”. IRAQI JOURNAL OF STATISTICAL SCIENCES 7, no. 2 (December 1, 2007): 77–97. Accessed September 17, 2025. https://ojs.uomosul.edu.iq/index.php/stats/article/view/29002.