Haaland, S. E., Sonnerup, B. U. Ö., Dunlop, M. W., Balogh, A., Georgescu, E., Hasegawa, H., et al. (2004). Four-spacecraft determination of magnetopause orientation, motion and thickness: comparison with results from single-spacecraft methods. Annales Geophysicae, 22(4), 1347-1365.