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Published online by Cambridge University Press: 04 August 2010
We thank the hospitality and financial support at Euroschool and Euroconference PQR2003. A. S. C. acknowledges partial support of SNF Grant No. 20–100029/1.
We are very grateful to Carlo A. Rossi and Jim Stasheff for carefully reading the manuscript and making several suggestions to improve the text. We also want to thank Benoit Dherin and Luca Stefanini for the stimulating discussions we have had with them.
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