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;
Kofman, W., & Nielsen, E. (1990). STARE and EISCAT measurements: Evidence for the Limitation of the STARE observations by ion-acoustic velocity. Journal Geophysical Research, 95, 19131.