Christensen, Ulrich R. Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society; MPI for Aeronomy, Max Planck Institute for Solar System Research, Max Planck Society;
Ritter, J. R. R., Achauer, U., & Christensen, U. R. (2000). The Teleseismic Tomography Experiment in the Eifel Region, Central Europe: Design and First Results. Seismological Research Letters, 71(4), 437-443.