J. Politiek, Total elastic cross-sections for scattering of potassium by noble gases in the electron-volt region (Alkali beams obtained by cathode sputtering), University of Amsterdam, UvA, 1970-04-29
T.F.M. Bonsen and L. Vriens, Angular distribution of electrons ejected by charged particles I. Ionization of He and H2 by protons, Physica 47, 307-319 (1970)