1. The lightning discharge;Bruce;J. Inst Elec. Eng.,1941
2. Low light level TV images of terrestrial lightning as viewed from space (abstract);Boeck;Eos Trans. AGU.,1991
3. Progessive lightning;Boys;Nature,1926
4. The return stroke of the lightning flash to earth as a source of VLF atmospherics;Dennis;Radio Sci,1964
5. Television image of a large upward electrical discharge above a thunderstorm system;Franz;Science,1990