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5 Acknowledgments

I wish to thank Gleb Arutyunov, Niklas Beisert, Sergey Frolov, Matthias Staudacher, Arkady Tseytlin and Marija Zamaklar for helpful discussions and important comments on the manuscript. This review grew out of a lecture delivered at the Post-Strings 2004 Meeting at Durham. I thank the organizers of the meeting for hospitality and an inspiring workshop.


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