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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Birkelund, Tove - Hakansson, Eckart
    Type: Article
    In: Zitteliana
    Volume: 10
    Date: 1982
    Page Range: 7--25
    Publication Info: Altötting [etc.], Komissionsverlag Geiselberger [etc.],
  2. By: Birkelund, Tove - Thusu, Bindra - Vigran, Jorunn Os
    Type: Article
    In: Palaeontology
    Volume: 21
    Date: 1978
    Page Range: 31--63
    Publication Info: London, Palaeontological Association, 1957-