• J. W. R. Fennema, The boundary condition to be used in the theoretical treatment of ion-atom collisions, Physica 39, 13-16 (1968)

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  • J. G. Bannenberg and A. Tip: A calibration system for total-pressure gauges in the range 10-3-10-5 torr In: Proceedings of the Fourth International Vacuum Congress Manchester, [s.n.], 1968. - pp. 609-612

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  • A. Vermeer and A. A. Ravenstein, A method for the measurement of small shifts of the resonance frequency of a microwave cavity, J. Phys. E 1, 152-154 (1968)

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  • H. J. Hopman and W. Ott, Saturation of beam-plasma instabilities due to a flattening of the beam distribution function, Plasma Phys. 10, 315-317 (1968)

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  • H. F. Vugts, A. Tip and J. H. Los, The Senftleben effect on diffusion, Physica 38, 579-586 (1968)

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  • D. Onderdelinden, Single-crystal sputtering including the channeling phenomenon, Can. J. Phys. 46, 739-745 (1968)

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  • R. Paul and A. E. de Vries, Separation of gas mixtures in chemical equillibrium in a temperature gradient. II, J. Chem. Phys. 48, 4867-4869 (1968)

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  • J.F.M. Aarts, F.J. de Heer and D.A. Vroom, Emission cross sections of the first negative band system of N2 by electron impact, Physica 40, 197-206 (1968)

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  • 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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  • 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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