Röttger, J. MPI for Aeronomy, Max Planck Institute for Solar System Research, Max Planck Society;
Röttger, J. (1994). STEP ground-based projects. In D. N. Baker, V. O. Papitashvili, & M. J. Teague (Eds.), Solar-Terrestrial Energy Program, The Initial Results from STEP Facilities and Theory Campaigns, Proc. STEP Symp./5. COSPAR Colloq., Laurel, USA 1992 (pp. 29-42). Amsterdam: Elsevier.