Al-Aloosy, Abdul-Kareem A., and Rasha Albert Elia Hallaji. “Performability Estimation of Token Ring Network”. Nahrain University College of Engineering Journal, vol. 11, no. 1, Mar. 2008, pp. 98-106, https://oldjournal.eng.nahrainuniv.edu.iq/index.php/main/article/view/501.