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I sincerely and friendly thank Jean-Pierre EHRMANN for the tremendous amount of help he kindly gave to me.

Many thanks also to Edward BRISSE and Clark KIMBERLING for their so useful catalogues of centers and all the other friends from Hyacinthos in particular Philippe Deléham, Antreas Hatzipolakis, Floor van Lamoen, Fred Lang, Wilson Stothers, Paul Yiu.