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  1. By: Popov, Leonid - Holmer, Lars E - Rowell, Albert J - Peel, John S
    Type: Article
    In: Palaeontology
    Volume: 40
    Date: 1997
    Page Range: 337--354
    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-