Heiland, W. Experimental Plasma Physics 2 (E2), Max Planck Institute for Plasma Physics, Max Planck Society;
Tolk, N., Heiland, W., Tully, J., Kraus, J., & Neff, S. (1979). Elliptic Polarization from Grazing-Incidence Collisions of Hydrogen Ions on Polycristalline and Single-Crystal Surfaces. Surface Science, 90, 447-460.