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Burnside, R. G., and C. A. Tepley, Airglow intensities observed in the Southern and Northern Hemispheres, Planet. Space Sci., 38, 1,161-1,177, 1990.

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Johnson, M. W., Electron density comparison between radar observations and 3-D ionospheric model calculations, Master's thesis, Utah State University, Logan, Utah, 1990.

Melendez-Alvira, D. J., Theory and measurements of nighttime horizontal gradients in the mid-latitude F region, Ph.D. thesis, University of Michigan, Ann Arbor, MI, 1990.

Noble and Djuth(1990)
Noble, S. T., and F. T. Djuth, Simultaneous Measurements of HF-Enhanced Plasma Waves and Artificial Field-Aligned Irregularities at Arecibo, J. Geophys. Res., 95, 15,195-15,207, 1990.

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