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)
L. Vriens, J.A. Simpson and S.R. Mielczarek, Tests of born approximations: Differential and total 23S,21P,and 21S cross sections for excitation of He by 100- to 400-eV electrons, Phys. Rev. 165, 7-15 (1968)
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)
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)
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)
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)
