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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Beckers, Gustav
    Type: Article
    In: Wiener entomologische Zeitung
    Volume: 11
    Date: 1892
    Page Range: 318--319
    Publication Info: Wien, E. Reitter [etc.],
  2. By: Beckers, Gustav
    Type: Article
    In: Entomologische Nachrichten
    Volume: 12
    Date: 1886
    Page Range: 174--175
    Publication Info: Berlin [etc.], R. Friedländer [etc.],