1. D.J. Ewins: Modal Testing: Theory, Practice and Application (Research Studies Press, Baldock 2001)
2. Proceedings of International Conference on Modal Analysis, 1982-2006 (Society for Experimental Mechanics, Bethel 1982-2006)
3. R. J. Allemang: Academic Course Info, Dynamics Research Laboratory (Univ. Cincinnati, Cincinnati 2003)
4. B.J. Schwarz, M.H. Richardson: Experimental Modal Analysis, unpublished report (Vibrant. Technology, Scotts Valley 1999),
http://www.vibetech.com/papers/paper28.pdf
5. Agilent Technologies: The Fundamentals of Modal Testing, Applic. Rep. 243-2 (Agilent Technologies, Palo Alto 2000)