1. For a typical example see: MassLynx Version 4.0 User's Guide, pp. 457â458 via http://www.waters.com [22 June 2009].
2. For open-access isotope pattern calculators see: (a) Sheffield ChemPuter isotope pattern calculator, M Winter: http://winter.group.shef.ac.uk/chemputer/ [22 June 2009];
3. (b) Molecular weight calculator, M. Monroe: http://www.alchemistmatt.com/mwtwin.html. Available at http://ncrr.pnl.gov/software/ [22 June 2009];
4. (c) IsoPro3, M. Senko: via: http://www.oc.uni-koeln.de/ms-oc/download/isopro3.zip [22 June 2009];
5. (d) Molecular Weight and Isotopic Abundance calculator. W. Zheng: http://www.ifa.hawaii.edu/â¼zhengwj/Applets/IsoPattern.html [27th Jan 2009];