1. Damant A, Castle L (1999) In: Proc Pira Int Symp on Paper in Contact with Foodstuffs, 16 Dec 1999, Edinburgh, UK
2. Nerín C, Asensio E, Jiménez C (2002) Anal Chem 74:5831–5836
3. CoE (2002) Partial agreement in the social and public health fields, technical socument no. 2. Council of Europe, Strasbourg
4. CEN (1998) European prestandard ENV 1186–13, pt 13. European Committee for Standardization, Brussels
5. Aurela B, Kulmala H, Söderhjelm L (1999) Food Addit Contam 12:571–577