1. Bode H. (1976). “Columns of steel tubular sections filled with concrete design and applications.” Acier Stahl 11/12 388–393.
2. Bridge R. Q. (1976). “Concrete filled steel tubular columns.” Rep. No. R283 School of Civ. Engrg. Univ. of Sydney Sydney Australia.
3. Bridge R. Q. (1994). “Tests of thin-walled concrete-filled steel tubes.” Presentation Prepared for Dept. of Civ. Engrg. Univ. of Minnesota Minneapolis.
4. Chen W. F. and Atsuta T. (1976). Theory of beam-columns vol. 1: in-plane behavior and design . McGraw-Hill Book Co. Inc. New York N.Y.
5. Chen W. F. and Atsuta T. (1977). Theory of beam columns vol. 2: space behavior and design . McGraw-Hill Book Co. Inc. New York N.Y.