1. M.C. Blaich, in: Karl der Große in Ingelheim, Ausstellungskat. Ingelheim, 1998, p. 149
2. High-Energy PIXE using 68 MeV protons
3. J.F. Ziegler, J.P. Biersack, U. Littmark, The Stopping and Ranges of Ions in Matter, Vol. 1, Plenum, New York, 1985
4. J.H. Hubbell, S.M. Seltzer, Tables of X-ray Mass Attenuation Coefficients and Mass Energy-Absorption Coefficients, Originally published as NISTIR 5632, National Institute of Standards and Technology, Gaithersburg, MD, 1995