5 citations as recorded by crossref.

1. The disturbed auroral ionosphere based on EISCAT and rocket data M. Friedrich et al. https://doi.org/10.1016/j.asr.2003.08.007
2. An extension for the model IMAZ for large absorption M. Friedrich & G. Landauer https://doi.org/10.5047/eps.2010.12.008
3. Multi beam observations of cosmic radio noise using a VHF radar with beam forming by a Butler matrix T. Renkwitz et al. https://doi.org/10.5194/ars-9-349-2011
4. Perturbations in EISCAT electron densities visualised by normalisation M. Friedrich et al. https://doi.org/10.1016/j.asr.2006.02.039
5. Invited Article: Digital beam-forming imaging riometer systems F. Honary et al. https://doi.org/10.1063/1.3567309