1. Hafeez Khan T. A. “Investigation of the Strength of the Biaxially Loaded Reinforced Concrete Ell Shaped Columns ” thesis presented to the Indian Institute of Technology at Kharagpur India in 1971 in partial fulfillment of the requirements for the Degree of Doctor of Philosophy.
2. The design of biaxially loaded columns by ultimate load methods
3. Ramamurthy L. N. “Investigation of the Ultimate Strength of Square and Rectangular Columns under Biaxially Eccentric Loads (ACI‐SP‐13 Paper No. 12) ” Symposium on Reinforced Concrete Columns American Concrete Institute Detroit Mich. 1966 pp. 263–298.