Wilhelm, K. MPI for Aeronomy, Max Planck Institute for Solar System Research, Max Planck Society; Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society;
Wilhelm, K., Saeger, K.-H., Becker, C., Schmidt, R., & Engelhardt, W.(1976). Suprathermal electron experiment (KL 7) Experiment no. 8a on the porcupine payload (MPAE-T-100-76-03). Katlenburg-Lindau, Germany: Max-Planck-Institut für Sonnensystemforschung.