Clement, B. M.; Kent, D. V.; Opdyke, N. D. (1982): Brunhes-Matuyama polarity transition in three deep-sea sediment cores. Royal Society of London, London, United Kingdom, In: Runcorn, S. K. (editor), Creer, K. M., Jacobs, J. A., The Earth's core; its structure, evolution and magnetic field; discussion, 306 (1492), 112-119, georefid:1985-007988