Gustafsson, G., W. Baumjohann, and I. Iversen. “Multi-Method Observations and Modelling of the Three-Dimensional Currents Associated With a Very Strong Ps6 Event”. Journal of Geophysics, Vol. 49, no. 1, Jan. 1981, pp. 138-45, https://journal.geophysicsjournal.com/JofG/article/view/211.