1. “Sensitivity Analysis of Discrete Structural Systems”;Adelman;AIAA Journal,1986
2. D. V. Murthy and R. T. Haftka, “Survey of Methods for Calculating Sensitivity of General Eigenproblems”, NASA Symposium on Sensitivity Analysis in Engineering, Hampton, Virginia, 177–196 (1987).
3. “Rates of Change of Eigenvalues with Reference to Buckling and Vibration Problems,”;Wittrick;Journal of the Royal Aeronautical society,1962
4. “Rates of Change of Eigenvalues and Eigenvectors”;Fox;AIAA Journal,1968
5. “Minimum Weight Design with Stability Constraint”;Zarghamee;Journal of the Structural Division of ASCE,1970