Eccles, « On the Diurnal Variations of the Electric Waves Occurring in Nature, and on the Propagation of Electric Waves Round the Bend of the Earth », Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, vol. 87, no 593, , p. 79 (DOI10.1098/rspa.1912.0061, Bibcode1912RSPSA..87...79E)
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Eccles, « On the Diurnal Variations of the Electric Waves Occurring in Nature, and on the Propagation of Electric Waves Round the Bend of the Earth », Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, vol. 87, no 593, , p. 79 (DOI10.1098/rspa.1912.0061, Bibcode1912RSPSA..87...79E)