M.J. van der Wiel and C.E. Brion, "Photoelectron" spectroscopy by electron inpact coincidence measurements of scattered and ejected electrons in CO, J. Electron Spectrosc. Relat. Phenom. 1, (1972)
J. Schutten, Some measurements on charge exchange between nitrogen atoms and noble gas ions using the inclined beams technique, University of Amsterdam UvA, 1971-12-15