Kangas, J., T. Pikkarainen, Yu. Golikov, L. Baransky, V.A. Troitskaya, and V. Sterlikova. 1979. “Bursts of Irregular Magnetic Pulsations During the Substorm”. Journal of Geophysics 46 (1), 237-47. https://journal.geophysicsjournal.com/JofG/article/view/287.