Ahmed, Rikan. “Markov Chains Between Theory and Application In the Economic, Administrative or Financial Field”. TANMIYAT AL-RAFIDAIN 30, no. 92 (December 1, 2008): 239–256. Accessed September 10, 2025. https://edusj.uomosul.edu.iq/index.php/tanmiyat/article/view/29930.