9GRODON R L, HORD H. Ignition of gases by sparks pro- duced by breaking wires at high speed [J]. Nature, 1961, 191 (16) :237 - 240.
10JOHANNSMEYER U. On the ignition of explosive atmos- pheres by short duration sparking -when capacitive intrinsi- cally safe circuits are discharged by short - circuit [ J ]. Ex Magazine, 1989(12) :4 - 8.
