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Koenig, A.; Eloed, E.
Ber., 1914 , vol. 47, p. 520
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Strutt, R. J.
Proceedings of the Royal Society of London, Series A: Mathematical, Physical and Engineering Sciences, 1911 , vol. 85, p. 222 - 227
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Eloed, E.
Dissert. Karlsruhe T. H. 1915, p. 37