Nielsen, E. MPI for Aeronomy, Max Planck Institute for Solar System Research, Max Planck Society; Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society;
Nielsen, E. (1998). Mars riometer system. In E. Attema, G. Schwehm, & A. Wilson (Eds.), Proc. 32nd ESLAB Symp. `Remote Sensing Methodology for Earth Observation and Planetary Exploration' ESTEC, Noordwijk, The Netherlands (pp. 215-223). Noordwijk: ESA Publ. Div.