Stephenson, F. R.; Morrison, L. V. (1984). "Long-Term Changes in the Rotation of the Earth: 700 B. C. to A. D. 1980". Philosophical Transactions of the Royal Society A (Royal Society) 313 (1524): 47–70. doi:10.1098/rsta.1984.0082. Bibcode: 1984RSPTA.313...47S.
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Stephenson, F. R.; Morrison, L. V. (1984). "Long-Term Changes in the Rotation of the Earth: 700 B. C. to A. D. 1980". Philosophical Transactions of the Royal Society A (Royal Society) 313 (1524): 47–70. doi:10.1098/rsta.1984.0082. Bibcode: 1984RSPTA.313...47S.