Nielsen, E. MPI for Aeronomy, Max Planck Institute for Solar System Research, Max Planck Society; Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society;
Haldoupis, C., & Nielsen, E. (1989). Very large phase velocities of non two-stream, meter scale irregularities in the high latitude E region ionosphere. Journal Geophysical Research, 94, 13489.