GEMAS: Establishing geochemical background and threshold for 53 chemical elements in European agricultural soil - Reimann, Clemens; Fabian, Karl; Birke, Manfred; Filzmoser, Peter; Demetriades, Alecos; Négrel, Philippe; Oorts, Koen; Matschullat, Jörg; de Caritat, Patrice; Albanese, S.; Anderson, M.; Baritz, R.; et al. (Elsevier BV, 2018)