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)
M.F. Laranjeira, An elementary theory of thermal and pressure diffusion in gaseous binary and complex mixtures II. Binary mixtures with experimental comparison, Physica 26, 417-430 (1960)
H.A. Tasman and A.J.H. Boerboom, Elimination of the radial second order angular aberrations in inhomogeneous field mass spectrometers by inclined plane boundaries, Z. Naturforsch. Teil A 15, 736-738 (1960)