1. Christian DG (2003) Analytical chemistry. Wiley, Hoboken, NJ
2. Harris CD, Harris H (2002) Quantitative chemical analysis. Freeman, New York NY
3. Eppendorf product catalog, 2004; see also http://www.eppendorf.com/physiocare/microsite/download/sop_e.pdf . and US patents 4,905,526, and 4,406,170
4. Rainin’s international pipetting system catalog, 2004; see also http://www.rainin-global.com/catalog/html
5. Thermo Electron Corporation product catalog (2004) Finnpipette Focus-brochure, www.thermo.com