Aubry, M. P. (1968). "Some results of the FR-1 satellite experiment on the VLF wave field in the zone close to the transmitter". Journal of Atmospheric and Terrestrial Physics. 30 (6): 1161–1182. Bibcode:1968JATP...30.1161A. doi:10.1016/S0021-9169(68)80005-4.
Aubry, M. P. (1968). "Some results of the FR-1 satellite experiment on the VLF wave field in the zone close to the transmitter". Journal of Atmospheric and Terrestrial Physics. 30 (6): 1161–1182. Bibcode:1968JATP...30.1161A. doi:10.1016/S0021-9169(68)80005-4.