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  1. By: Gramm, Mendelʹ Naumovich
    Type: Article
    In: Palaeontology
    Volume: 20
    Date: 1977
    Page Range: 475--482
    Publication Info: London, Palaeontological Association, 1957-
  2. By: Gramm, Mendelʹ Naumovich - Ivanov, V K
    Type: Article
    In: Palaeontology
    Volume: 18
    Date: 1975
    Page Range: 551--561
    Publication Info: London, Palaeontological Association, 1957-