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  1. By: Wright, Anthony David, - Nolvak, Jaak
    Type: Article
    In: Palaeontology
    Volume: 40
    Date: 1997
    Page Range: 113--119
    Publication Info: London, Palaeontological Association, 1957-
  2. By: Popov, Leonid - Nolvak, Jaak - Holmer, Lars E
    Type: Article
    In: Palaeontology
    Volume: 37
    Date: 1994
    Page Range: 627--650
    Publication Info: London, Palaeontological Association, 1957-