1. http://www.physics.uoguelph.ca/PIXE/gupix/gup_new.html
2. http://www.microbeams.co.uk/download.html
3. Technisches Buro T. Fischer, Am Berg 9, D-64 372 Ober-Ramstadt, Germany
4. Calibration and long-term stability of a PIXE set-up
5. PIXE: A Novel Technique for Elemental Analysis;Johansson,1988