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2. Anon (2001a). Comitè Européen de Normalisation. Fertilizers – Treatment with a cation exchange resin for the determination of the chelated micro-nutrient content and of the chelated fraction of micro-nutrients. EN 13366: 2001 E.
3. Anon (2001b). Comitè Européen de Normalisation. Fertilizers – Determination of chelating agents in fertilizers by ion chromatography – Part 1: EDTA, HEDTA and DTPA. EN 13368-1: 2001 E.
4. Anon (2001c). Comitè Européen de Normalisation. Fertilizers – Determination of chelating agents in fertilizers by ion chromatography – Part 2: EDDHA and EDDHMA. EN 13368-2: 2001 E.
5. Anon (2003). COMMISSION REGULATION (EC) No. 2003/2003 of the European Parliament and of the Council of 13 October 2003 relating to fertilisers.Official Journal of the European Union,L34, 1–100.