The time at BIRS was a great opportunity to meet different people dealing with problems related to my topics or some related topics. All the more people that I met for the first time or people that I have not seen for a long time. It was also a great opportunity to have different fruitful discussions about several scientific issues that give me some idea of future prospects. I would like also to thank the organizers for their great effort and for the organization of this excellent workshop in such a nice place. Thank you also for your email and for giving me the opportunity to thanks again the organizers and the BIRS center for this excellent week.

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