Carlson, A. Experimental Plasma Physics 1 (E1), Max Planck Institute for Plasma Physics, Max Planck Society;
Carlson, A. (2001). Probes Dominated by Ion-Neutral Collisions: Oblique Incidence and Saturation. Contributions to Plasma Physics, 41, 437-442. Retrieved from http://www3.interscience.wiley.com/cgi-bin/fulltext/85511990/PDFSTART.