Schlegel, K. MPI for Aeronomy, Max Planck Institute for Solar System Research, Max Planck Society;
Koehler, J. A., Haldoupis, C., Schlegel, K., & Virvilis, V. (1997). Simultaneous observations of E region coherent radar echoes at 2-m and 6-m radio wavelengths at midlatitude. Journal Geophysical Research, 102, 17255-17265.