Dulov, E. V., and A. V. Sinitsyn. 2005. “On a Theoretical Study of the Properties of Solutions of the Limit Problem for a Magnetically Noninsulated Diode”. Ukrains’kyi Matematychnyi Zhurnal 57 (6), 840–851. https://umj.imath.kiev.ua/index.php/umj/article/view/3647.