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Artificial optical emissions at HAARP for pump frequencies near the third and second electron gyro-harmonic. Annales Geophysicae. 23:1585-1592.. 2005.
First observations of X-mode suppression of O-mode HF enhancements at 6300 \AA. Geophysical Research Letters. 36:20102.. 2009.
Observations of artificial and natural optical emissions at the HAARP facility. Annales Geophysicae. 26:1089-1099.. 2008.