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., del Pozo, C. F., & Williams, P. J. S. (2002). VHF coherent radar signals from the E region ionosphere and the relationship to electron drift velocity and ion acoustic velocity. Journal Geophysical Research, 107(A6): 1012. doi:10.1029/2001JA900111.