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  1. By: Krassilov, Valentin A - Zherikhin, Vladimir V - Rasnitsyn, Alexander P.
    Type: Article
    In: Palaeontology.
    Volume: 40
    Date: 1997
    Page Range: 1095--1101
    Publication info: London :Palaeontological Association,1957-
  2. By: Krassilov, Valentin A
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 71
    Date: 1984
    Page Range: 577--592
    Publication info: St. Louis :Missouri Botanical Garden Press,1914-