«The Influence of a Magnetic Field on Radiation Frequency». Proceedings of the Royal Society of London (1854-1905). 60: 513. 1896. doi:10.1098/rspl.1896.0079.
«The Influence of a Magnetic Field on Radiation Frequency». Proceedings of the Royal Society of London (1854-1905). 60: 514. 1896. doi:10.1098/rspl.1896.0080.