Blokland, MHHerbold, HASterk, SSvan Doorn, Dvan Ginkel, LAStephany, RW2025-03-182025-03-182004https://rivm.openrepository.com/handle/10029/640539Proficiency test for norethandrolone and major metabolitesArticleIn: EuroResidue V. Global aspects of residues. Proceedings of the conference on residues of veterinary drugs in food, Noordwijkerhout, The Netherlands, May 2004. Federation of European Chemical Societies, 2004;337-432025-03-18