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2. K. KATO (1971) COLD ROLL-FORMING, Nikkan Kogyo Shinbun Co. (in Japanese)
3. Sheet Metal Indust., 48;AH Chilver,1971
4. H. SUZUKI, M. KIUCH and S. NAKAJIMA (1972) Experimental Investigations on Cold Roll-Forming Process, Report of The Institute of Industrial Science, Tokyo University, 22, p84.
5. A.C. WALKER (1975) DESIGN and ANALYSIS of COLD-FORMED SECTIONS, International Texbook Co.Ltd.