1. LaBoube R. A. (1977). “Strength of cold-formed steel webs in bending shear and a combination of bending and shear ” PhD thesis Univ. of Missouri-Rolla Mo.
2. LaBoube R. A. and Yu W. W. (1977). “Webs for cold-formed steel flexural members subjected to a combination of bending and shear.” Final Rep. Univ. of Missouri-Rolla Mo.
3. Robertson G. W. and Kurt C. E. (1986). “Behavior of nested Z-shaped purlins.” Proc. 8th Int. Spec. Conf. on Cold-Formed Steel Struct.
4. Specification for the design of cold-formed steel structural members . (1986). Am. Iron and Steel Inst. (AISI) New York N.Y.
5. Yu W. W. (1985). Cold-formed steel design . John Wiley & Sons Inc. New York N.Y.