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- Otte, S. (author), Kuenen, J.G. (author), Nielsen, L.P. (author), Paerl, H.W. (author), Zopfi, J. (author), Schulz, H.N. (author), Teske, A. (author), Strotmann, B. (author), Gallardo, V.A. (author), Jorgensen, B.B. (author) journal article 1999