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  1. By: Heydrich, F
    Type: Article
    In: Hedwigia
    Volume: 33
    Date: 1894
    Page Range: 267--306
    Publication Info: Dresden Verlag und Druck von C. Heinrich
  2. By: Heydrich, F
    Type: Article
    In: Mittheilungen aus der Zoologischen Station zu Neapal
    Volume: 14
    Date: 1901-06-11
    Page Range: 586--619
    Publication Info: Leipzig, Wilhelm Engelmann, 1879-1921
  3. By: Heydrich, F
    Type: Article
    In: Bulletin du MuseĢum d'histoire naturelle
    Volume: 8
    Issue: 6
    Date: 1902
    Page Range: 473--476
    Publication Info: Paris Impr. nationale 1895-1907