Matzka, J., Olsen, N., Fox Maule, C., Pedersen, L. W., Berarducci, A. M. and Macmillan, S. (2009) “Geomagnetic observations on Tristan da Cunha, South Atlantic Ocean”, Annals of Geophysics, 52(1), pp. 97–105. doi: 10.4401/ag-4633.