Jockers, K. 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;
Umbach, R., Jockers, K., & Geyer, E. H. (1998). Spatial distribution of neutral and ionic constituents in comet P/Halley. Astronomy and Astrophysics, Suppl. Ser., 127, 479-495.