[1] Chajes,L.,Principles of Structural Stability Theory,Prentice-Hall,Inc.(1974).
[2] Timoshenko,S.,Theory of Elastic Stability(1936).
[3] Clark,J.W.and H.N.Hill,Lateral buckling of beams,Transactions ASCE,127(1962).
[4] Galambos,T.V.,Inelastic lateral buckling of beams,Jour,of Struct.Division,ASCE,89,ST5(1963).
[5] Chien Wei-zang,Calculus of Variation and the Finite Element Method,Vol.I,Science Press(1980).(in Chinese)