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  1. By: Simutnik, Serguei - Perkovsky, Evgeny E. - Vasilenko, Dmitry
    Type: Article
    In: Journal of Hymenoptera Research
    Volume: 80
    Date: 2020
    Page Range: 137--145
    Publication Info: Pensoft Publishers 2020
    Subjects: Baltic amber  Eocene  prepectus  spur vein  Ukraine