Jhawar, D.S.; Chalmers, J.Alan (1967). "Point-discharge currents through small trees in artificial fields". Journal of Atmospheric and Terrestrial Physics. 29 (11): 1459–1463. Bibcode:1967JATP...29.1459J. doi:10.1016/0021-9169(67)90237-1.
Whitlock, W.S. and Chalmers J.A. (1956). "Short-period variations in the atmospheric electric potential gradient". Quarterly Journal of the Royal Meteorological Society. 82 (353): 325–336. Bibcode:1956QJRMS..82..325W. doi:10.1002/qj.49708235308.
Curry, A.; Kannangara, M.L.T.; Turver, K.E. (1974). "The effects of large extensive air showers on the Earth's atmospheric electric field". Journal of Atmospheric and Terrestrial Physics. 36 (2): 215–224. Bibcode:1974JATP...36..215C. doi:10.1016/0021-9169(74)90041-5.
Jhawar, D.S.; Chalmers, J.Alan (1967). "Point-discharge currents through small trees in artificial fields". Journal of Atmospheric and Terrestrial Physics. 29 (11): 1459–1463. Bibcode:1967JATP...29.1459J. doi:10.1016/0021-9169(67)90237-1.
Whitlock, W.S. and Chalmers J.A. (1956). "Short-period variations in the atmospheric electric potential gradient". Quarterly Journal of the Royal Meteorological Society. 82 (353): 325–336. Bibcode:1956QJRMS..82..325W. doi:10.1002/qj.49708235308.
Curry, A.; Kannangara, M.L.T.; Turver, K.E. (1974). "The effects of large extensive air showers on the Earth's atmospheric electric field". Journal of Atmospheric and Terrestrial Physics. 36 (2): 215–224. Bibcode:1974JATP...36..215C. doi:10.1016/0021-9169(74)90041-5.