1. Block, L. P., Fälthammar, C.-G., Lindqvist, P.-A., Marklund, G., Mozer, F. S., and Pedersen, A.: 1987,Measurement of Quasi-Static and Low Frequency Electric Fields on the Viking Satellite, Royal Institute of Technology Report, TRITA-EPP-87-02, 16 pp.
2. Fahleson, U. V., Fälthammar C.-G., and Pedersen, A.: 1974, ?Ionospheric Temperature and Density Measurements by Means of Spherical Double Probes?,Planet. Space Sci. 22, 41?66.
3. Grard, R. J. L.: 1973, ?Properties of the Satellite Photoelectron Sheath Derived from Photoemission Laboratory Measurements?,J. Geophys. Res. 78, 2885?2906.
4. Lindqvist, P.-A.: 1983, ?The Potential of ISEE in Different Plasma Environments?, inSpacecraft/Plasma Interactions and Their Influence on Field and Particle Measurements, ESA SP-198, 25?33.
5. Lindqvist, P.-A. and Marklund, G. T.: 1990, ?A Statistical Study of High-Latitude Electric Fields Measured on the Viking Satellite?,J. Geophys. Res. 95, 5867?5876.