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;
McDiarmid, D. R., & Nielsen, E. (1987). Coherent radar observations of a storm sudden commencement having a preliminary reverse impulse. Journal Geophysical Research, 92, 159.