1. Performance of Laterally Loaded Channel Beams by Geo. Winter Warner Lansing and R. B. McCalley. Research Engineering Structures Supplement (Colston Papers vol. II) p. 179 London 1949 (Reprinted in: Four Papers on the Performance of Thin Walled Structures Cornell University Eng. Exp. Station Reprint No. 33 Ithaca New York 1950).
2. Light Gage Steel Columns in Wall-Braced Panels by G. G. Green Geo. Winter and T. R. Cuykendall Cornell University Eng. Exp. Station Bulletin No. 35/ 2 1947. (Some of the analysis in this paper is open to criticism but becomes correct when applied to an "ideal" column merely by setting throughout y 0 = 0. This does not affect any of the results or the steps leading to them. For the details of the accurate and more extensive analysis with identical results see Ref. 6 below.)
3. Eng;Columns Wm.;Mech. Div. , EM3, Paper,1956
4. Theory of Elastic Stability by S. Timoshenko McGraw-Hill Book Co. New York 1936.