Hagfors, T. MPI for Aeronomy, Max Planck Institute for Solar System Research, Max Planck Society;
Gurevich, A., Carlson, H., Kelley, M., Hagfors, T., Karashtin, A., & Zybin, K. (1999). Nonlinear structuring of the ionosphere modified by powerful radio waves at low latitudes. Physics Letters A, 251, 311-321.