J. van Eck and J. Kistemaker, Charge exchange, ionization and electron loss cross-sections of Li ions and atoms of 5 to 22.5 keV in H2 and He, Physica 26, 629-630 (1960)
H.M.E. Schürmann, A.H.W. Aten, A.J.H. Boerboom, A.C.W.C. Bot, G. Couwenberg, D.F. Dance, P.M. Hurley, D. Ledent, H. Stauffer, J.J.S. Steensma and R. Suringa, Fourth preliminary note on age determinations of magnetic rocks by means of radioactivity, Geol. Mijnb. 39, 93-104 (1960)
H.A. Tasman, A.J.H. Boerboom and H. Wachsmuth, Calculation of the ion optical properties of inhomogeneous magnetic sector fields: Note on the trajectories outside the median plane with oblique incidence, and on the second order angular aberration coefficient, Z. Naturforsch. Teil A 15, 78-79 (1960)
