1. Theory of Elastic Stability;Timoshenko,1936
2. On the Method of Complementary Energy and Its Application to Structures Stressed Beyond the Proportional Limit, to Buckling and Vibrations, and to Suspension Bridges;Westergaard,1941
3. Note on the Method of Complementary Energy;Reissner;J. Maths Phys,1948
4. Rayleigh's Principle and its Application to Engineering;Temple,1933
5. Eigenwertaufgaben'mit Technischen Anwendungen;Collatz,1949