Reistad, J. P., Østgaard, N., Tenfjord, P., Laundal, K. M., Snekvik, K., Haaland, S., et al. (2016). Dynamic effects of restoring footpoint symmetry on closed magnetic field lines. Journal Geophysical Research, 121, 3963-3977. doi:10.1002/2015JA022058.