1. Calculus of Variations;Gelfand,1963
2. Buckling of slanted columns;Chang;Journal of the Engineering Mechanics Division, American Society of Civil Engineers,1974
3. Vibration of inclined bars with end constraint;Chang;Journal of Sound and Vibration,1976
4. Vibration Problems in Engineering;Timoshenko,1974
5. Timoshenko's shear coefficient for flexural vibrations of beams;Mindlin,1955