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Wiltschko, W., Wiltschko, R. & Peters, D.S. Prof. Dr. Friedrich Wilhelm Merkel 27.8.1911–12.8.2002. J Ornithol 144, 111–114 (2003). https://doi.org/10.1007/BF02465525
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DOI: https://doi.org/10.1007/BF02465525