• J. van den Bos, G.J.M. Winter and F.J. de Heer, Excitation of helium by protons in the 1-150 keV region, Physica 40, 357-384 (1968)

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  • G.A. Stevens and A.E. de Vries, The influence of the distribution of atomic masses within the molecule on thermal diffusion: II. Isotopic methane and methane/argon mixtures, Physica 39, 346-360 (1968)

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  • H.J. Hopman, T. Matitti and J. Kistemaker, The electron cyclotron instability and high-frequency ionization in a beam-plasma experiment, Plasma Phys. 10, 1051-1067 (1968)

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  • A.C. Levi, F.R. McCourt and A. Tip, Electric field Senftleben-Beenakker effects, Physica 39, 165-204 (1968)

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  • J.F.M. Aarts and F.J. de Heer, Extension of the branching-ratio method for intensity calibration between 1500 and 2600 Å, J. Opt. Soc. Am. 58, 1666-1667 (1968)

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  • J.-B. Sanders and M.W. Thompson, The generation of focused collision sequences in irradiated crystals: a calculation based on the inverse square potential, Philos. Mag. 17, 211-214 (1968)

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  • J. Schutten, Lasers, principe en toepassingen, Polytech. Tijdschr. E 23, (1968)

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  • R. Paul and A.E. de Vries, Separation of gas mixtures in chemical equilibrium in a temperature gradient. I, J. Chem. Phys. 48, 445-450 (1968)

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  • L. Vriens, C.E. Kuyatt and S.R. Mielczarek, Tests of born approximations; Differential and total cross sections for elastic scattering of 100- to 400-eV electrons by helium, Phys. Rev. 170, 163-169 (1968)

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  • H.R. Moustafa Moussa and F.J. de Heer, Excitation of helium to excited ion states by electron and proton impact, Physica 36, 646-654 (1967)

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