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  1. By: Riggenbach, Emanuel
    Type: Article
    In: Revue suisse de zoologie
    Volume: 4
    Issue: 1
    Date: 1896
    Page Range: 165--275
    Publication Info: Genève, Kundig [etc.],
  2. By: Riggenbach, Emanuel
    Type: Article
    In: Zoologische Jahrbücher
    Volume: 12
    Date: 1899
    Page Range: 145--153
    Publication Info: Jena [Germany], G. Fischer,