1. 1 Allemang, R.J. & Brown, D.L. (1982) A correlation coefficient for modal vector analysis. In: Proceedings of the 1st International Modal Analysis Conference, Orlando, Florida, pp. 110-116.
2. 2 Brylawski, A.M. (1994) An investigation of three dimensional deformation of a golf club during downswing. In: Science and Golf II: Proceedings of the World Scientific Congress of Golf (eds A.J. Cochran & M.R. Farrally), pp. 265-270.
3. 3 Dawe, D.J. (1984) Matrix and Finite Element Displacement Analysis of Structures. Oxford University Press, Oxford.
4. 4 Ewins, D.J. (1984) Modal Testing: Theory and Practice. Research Studies Press Ltd., John Wiley.
5. Rates of change of eigenvalues and eigenvectors;Fox;AIAA Journal,1968