Schlegel, K. MPI for Aeronomy, Max Planck Institute for Solar System Research, Max Planck Society;
Link (beliebiger Volltext)
Haldoupis, C., Schlegel, K., & Hussey, G. (2000). Auroral E-region electron density gradients measured with EISCAT. Annales Geophysicae, 18(9), 1172-1181.