1. R. Boyd, Proc. Phys. Soc., B64, 795–804 (1951).
2. V. M. Zakharova, Yu. M. Kagan, K. M. Mustafin, V. I. Perel, Tech. Phys. [in Russian], 30, Issue 4, 442–449 (1960).
3. B. Davydov, L. Zmanovskaya, Tech. Phys. [in Russian], 6, Issue 7, 1244–1255 (1936).
4. K. N. Ulyanov, Tech. Phys. [in Russian], 40, Issue 4, 790–797 (1970).
5. V. I. Sysun, Probe Methods of Plasma Diagnostics [in Russian], Petrozavodsk University publishing house, Petrozavodsk (1997).