Solomon Marius, L., et al. “Measurements of Plasma Diffusion Coefficient in Pilot-PSI Device Using Katsumata Probe”. Journal of Automation, Mobile Robotics and Intelligent Systems, vol. 3, no. 4, Jan. 2013, pp. 160-2, https://jamris.d.tomp.pl/index.php/JAMRIS/article/view/76.