Fejer, J. A., Ierkic, H. M., Woodman, R. F., Röttger, J., Sulzer, M., Behnke, R. A., et al. (1983). Observations of the HF-enhanced plasma line with a 46.8-MHz radar and reinterpretation of previous observations with the 430-MHz radar. Journal Geophysical Research, 88, 2083-2092.