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Koskela, J. ,  de Vries, M.G. ,  Kajba, D. ,  Wühlisch, G. von ,  [Populus nigra Network: Report of the 7th (25-27 October 2001, Osijek, Croatia) and 8th (22-24 May 2003, Treppeln, Germany) meetings] ,  Populus nigra Network: Report of the 7th (25-27 October 2001, Osijek, Croatia) and 8th (22-24 May 2003, Treppeln, Germany) meetings

Koskela, J. ,  Samuel, C.J.A. ,  Mátyás, Cs. ,  Fady, B. ,  [Conifers Network: Report of the fourth meeting (18-20 October 2003, Pitlochry, United Kingdom)] ,  Conifers Network: Report of the fourth meeting (18-20 October 2003, Pitlochry, United Kingdom)