1. Vanguard-rearguard analytical strategies
2. M. Valcárcel, S. Cárdenas, D. Barceló, L. Buydens, K. Heydorn, B. Karlberg, K. Klemm, B. Lendl, B. Milman, B. Neidhart, A. Ríos, R. Stephany, A. Townshend, A. Zschunke, Metrology of qualitative chemical analysis, Report EUR 20605 EN, Luxemburgo, European Union, Luxemburg, 2002.
3. S.R.L. Ellison, W.A. Hardcastle, Expression of uncertainty in qualitative testing, LGC Report, LGC/VAM/2002/021, LGC, Teddington, Middlesex, UK, 2002.
4. Uncertainties in qualitative testing and analysis
5. W.A. Hardcastle, Qualitaitve Analysis, A Guide to Best Practice, LGC, Teddington, Middlesex, UK, 1998.