Kuppers, F., J. Untiedt, W. Baumjohann, K. Lange, and A.G. Jones. “A Two-Dimensional Magnetometer Array for Ground-Based Observations of Auroral Zone Electric Currents During the International Magnetospheric Study (IMS)”. Journal of Geophysics 46, no. 1 (April 26, 1979): 429-450. Accessed October 3, 2025. https://journal.geophysicsjournal.com/JofG/article/view/160.