F.W.E. Knoop, H.H. Brongersma and A.J.H. Boerboom, A new method to study molecules by electron impact spectroscopy, Chem. Phys. Lett. 5, 450-452 (1970)
K.B. Winterbon, P. Sigmund and J.-B. Sanders, Spatial distribution of energy deposited by atomic particles in elastic collisions, K. Dan. Vidensk. Selsk. Mat. -Fys. Medd. 37, 5-73 (1970)
J.A. Cabral and H.J. Hopman, Correlated beam distribution functions at the transition 1st-2nd regime in a beam-plasma experiment, Plasma Phys. 12, 759-777 (1970)