by Donadini, F., Kovacheva, M., Kostadinova, M., Hedley, I.G., Pesonen, L.J.
Published in Physics and chemistry of the earth. Parts A/B/C (2008)

by Forsyth, J B, Hedley, I G, Johnson, C E
Published in Journal of physics. C, Solid state physics (01.02.1968)

by Veitch, R. J., Hedley, I. G., Wagner, J.-J.
Published in Geophysical Journal of the Royal Astronomical Society (01.11.1983)

by Hedley, I. G
Year of Publication 1970