Atrazine in the environment 20 years after its ban: long-term monitoring of a shallow aquifer (in western Germany) and soil residue analysis / David Stefan Vonberg ; publisher and distributor: Forschungszentrum Jülich GmbH, Zentralbibliothek. Jülich : Forschungszentrum Jülich GmbH, Zentralbibliothek, 2015