Al-Sharrbaf, Ihsan A. S., et al. “Factors Affecting the Slenderness Limit for RC Columns-The Use of the (ACI-318M-05) Provisions”. Nahrain University College of Engineering Journal, vol. 11, no. 3, Mar. 2008, pp. 342-56, https://oldjournal.eng.nahrainuniv.edu.iq/index.php/main/article/view/530.