Eccles, W. H. (1912). “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 Sciences87 (593): 79. Bibcode: 1912RSPSA..87...79E. doi:10.1098/rspa.1912.0061.
Eccles, W. H. (1912). “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 Sciences87 (593): 79. Bibcode: 1912RSPSA..87...79E. doi:10.1098/rspa.1912.0061.