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;
Nielsen, E., Senior, C., & Lühr, H. (1988). Ionospheric hall conductivity deduced from ground-based measurements. Journal Geophysical Research, 93, 4125.