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 (Jan. 2009), 97–105. DOI:https://doi.org/10.4401/ag-4633.