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Proceedings of the Royal Society of London, ISSN 0370-1662, 1/1904, Volume 74, Issue 497-506, pp. 414 - 420
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Proceedings of the Royal Society of London. Series A, Containing papers of a mathematical and physical character, ISSN 0950-1207, 7/1909, Volume 82, Issue 557, pp. 560 - 567
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