13. Acknowledgements

The authors would like to thank Dennis Ferguson, John Scudder, Paul Traina, and Tony Li for the many discussions resulting in this work. This idea was developed from an earlier discussion between Tony Li and Dimitri Haskin.

In addition, the authors would like to acknowledge valuable review and suggestions from Yakov Rekhter on this document, and helpful comments from Tony Li, Rohit Dube, John Scudder, and Bruce Cole.