Schwenn, R. Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society; MPI for Aeronomy, Max Planck Institute for Solar System Research, Max Planck Society;
Hick, P., Jackson, B. V., & Schwenn, R. (1992). Synoptic maps of heliopheric thomson scattering brightnness from 1974-1985 as observed by the helios photometers. In E. Marsch, & R. Schwenn (Eds.), Solar Wind Seven, COSPAR Colloquia Series Volume 3 (pp. 187-190). Oxford, New York, Seoul, Tokyo: Pergamon Press.
