1. Adhikari, S.: Damping models for structural vibration. Ph.D. Thesis, Cambridge University, Engineering Department (2000)
2. Adhikari, S.: Classical normal modes in non-viscously damped linear systems. AIAA J. 39(5), 1–3 (2001)
3. ASTM E 756-04: Standard test method for measuring vibration damping properties of materials. American Society for Testing and Materials (2004)
4. Bellanger, M.: Digital Processing of Signals: Theory and Practice. Wiley-Interscience, New York (1984)
5. Boltzmann, L.: On the theory of the elastic aftereffect. Poggendorff’s Ann. Phys. Chem. 7, 624–645 (1876)