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  1. By: Ågren, Hugo,
    Type: Article
    In: Entomologisk tidskrift
    Volume: 24
    Date: 1903
    Page Range: 126--128
    Publication Info: Stockholm Jacob Spångberg 1880-
  2. By: Ågren, Hugo,
    Type: Article
    In: Entomologische Zeitung
    Volume: 64
    Date: 1903
    Page Range: 113--176
    Publication Info: [Stettin Entomologischer Verein zu Stettin 1840-1911]