Möller, W. Surface Science (OP), Max Planck Institute for Plasma Physics, Max Planck Society;
Ullmann, J., Wolf, G. K., & Möller, W. (1993). Ion stimulated densification of amorphous carbon films. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 1507-1510. doi:10.1016/0168-583X(93)90831-P.