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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Backhaus, H.
    Type: Article
    In: Entomologische Nachrichten
    Volume: 7
    Date: 1881
    Page Range: 274--277
    Publication Info: Berlin [etc.], R. Friedländer [etc.],
  2. By: Backhaus, H.
    Type: Article
    In: Entomologische Zeitung
    Volume: 37
    Date: 1876
    Page Range: 192--194
    Publication Info: [Stettin Entomologischer Verein zu Stettin 1840-1911]