1. Column Research Committee (1971). Handbook of Structural Stability Corona Tokyo Chap. 1.
2. Determination of the greatest height consistent with stability that a vertical pole or mast must be made, and of the greatest height to which a tree of given proportions can grow.;Greenhill A. G.;Proc. Cambridge Philos. Soc.,1881
3. Buckling of elastically restrained columns.;Gurfinkel G.;J. Struct. Div., ASCE,1965
4. Hoff N. J. (1956). The analysis of structures Wiley New York Chap. 3.
5. Timoshenko S. P. and Gere J. M. (1961). The theory of elastic stability McGraw-Hill New York Chap. 2.