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- Imberti, S. (author), Kockelmann, W. (author), Celli, M. (author), Grazzi, F. (author), Zoppi, M. (author), Botti, A. (author), Sodo, A. (author), Imperiale, M.L. (author), De Vries-Melein, M. (author), Visser, D. (author), Postma, H. (author) journal article 2008