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  1. Evolution, taxonomy and relationships of the Silurian conodont Pterospathodus
    By: Männik, Peep - Aldridge, Richard J
    Type: Article
    In: Palaeontology.
    Volume: 32
    Date: 1989
    Page Range: 893--906
    Publication info: London :Palaeontological Association,1957-
    View Article
  2. Microfossil distribution across the base of the Wenlock Series in the type area
    By: Mabillard, John E - Aldridge, Richard J
    Type: Article
    In: Palaeontology.
    Volume: 28
    Date: 1985
    Page Range: 89--100
    Publication info: London :Palaeontological Association,1957-
    View Article