1. Use of vectors in vibration measurement and analysis;Kennedy;Journal of Aeronautical Sciences,1947
2. Modal Testing: Theory and practice;Ewins,1984
3. R.J. Allemang, Vibration: Experimental Modal Analysis, UC-SDRL-CN-20-263-662, 1995.
4. Finite difference formulation for modal parameter estimation;Yin;Journal of Sound and Vibration,2000
5. Theoretical and Experimental Modal Analysis;Maia,1996