FitzGerald, George Francis (1889년 5월 17일). “The Ether and the Earth’s Atmosphere”. 《Science》 13 (328): 390. doi:10.1126/science.ns-13.328.390-a.
Larmor, Joseph (1897). “A Dynamical Theory of the Electric and Luminiferous Medium. Part III. Relations with Material Media”. 《Philosophical Transactions of the Royal Society of London A》 190: 205–493. doi:10.1098/rsta.1897.0020.