Spark discharge formation in an inhomogeneous electric field under conditions of runaway electron generation / T. Shao, V. F. Tarasenko, C. Zhang [et.al.] // Journal of applied physics. 2012. Vol. 111, № 2. P. 023304-1-023304-10. URL: http://vital.lib.tsu.ru/vital/access/manager/Repository/vtls:000436489