Negodenko, O. N., E. B. Lukjanenko, and D. V. Zaruba. “Analogs of Negatrones for Protection of a Power Circuit Against Overload”. Technology and Design in Electronic Equipment, no. 5, Oct. 2004, pp. 11-13, https://www.tkea.com.ua/index.php/journal/article/view/TKEA2004.5.11.