Koch, B., Bohmeyer, W., Fussmann, G., Matyash, K., & Schneider, R. (2006). Experiments on the angular dependence of the ion energy reflection coefficient at low energies. Contributions to Plasma Physics, 46, 379-384. Retrieved from http://www3.interscience.wiley.com/cgi-bin/fulltext/112652784/PDFSTART.