1. Wise SA (1993) In: Barcelo D (ed) Environmental analysis—techniques, applications and quality assurance. Elsevier, Amsterdam, The Netherlands, pp 403–446
2. Wise SA, Schantz MM (1997) In: Clement R, Siu M (eds) Reference materials for environmental analysis: making and using them. Lewis, Boca Raton, FL, pp 143–186
3. Wise SA, Schantz MM, Poster DL, Lopez de Alda MJ, Sander LC (1999) In: Barcelo D (ed) Sample handling and trace analysis of pollutants: techniques, applications and quality assurance. Elsevier, Amsterdam, The Netherlands, pp 649–687
4. European Commission Joint Research Centre (2002) BCR—Certified reference materials. Institute for reference materials and measurements (IRMM), Retieseweg, B-2440 Geel, Belgium. http://www.irmm.jrc.be/ . Cited 15 August 2002
5. Sharpless KE, Colbert JC, Greenberg RR, Schantz MM, Welch MJ (2001) Fresenius J Anal Chem 370:275–278