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  1. By: Holmgren, Nils F
    Type: Article
    In: Transactions of the Linnean Society of London. Zoology
    Volume: 14
    Series: 2
    Date: 1910
    Page Range: 135--148
    Publication Info: London, [The Society], 1879-
  2. By: Holmgren, Nils F
    Type: Article
    In: Mitteilungen aus dem Naturhistorischen Museum in Hamburg
    Volume: 27
    Date: 1910
    Page Range: 171--325
    Publication Info: Hamburg, Lütcke & Wulff, 1884-1915