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We wish to sincerely thank and acknowledge and are indebted to R.K. Olson, M.M. Schoeneberger, and S.G. Aschmann for their contributions to parts of this chapter. We have reproduced verbatim or with slight modifications of their writings in the first edition of this chapter. Similarly, we are also indebted to Caron et al. (2008), as some portions in this chapter have been adapted from their publication.