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F.W. Byron, C.J. Joachain and M.J. van der Wiel, On the double ionization of helium-like atoms by high-energy electron impact, J. Phys. B: At., Mol. Opt. Phys. 6, 375-377 (1973)
W.F. van der Weg, W.H. Kool, H.E. Roosendaal and F.W. Saris, Silicon surface studies by means of proton backscattering and proton induced x-ray emission, Radiat. Eff. 17, 245-252 (1973)
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C. Backx and M.J. van der Wiel, Een tweevoudige en drievoudige coïncidentietechniek voor het bepalen van de oscillatorsterkte voor de vorming van iontoestanden, NTvN 39, 78-81 (1973)
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