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  1. By: Verheyde, Fons - Sioen, Geert
    Type: Article
    In: Journal of Hymenoptera research
    Volume: 72
    Date: 2019
    Page Range: 67--81
    Publication Info: Washington, D.C International Society of Hymenopterists
    Subjects: Ash  gregariousness  Migration  Phenology  sawfly  urban