"The Influence of a Magnetic Field on Radiation Frequency". Proceedings of the Royal Society of London60 (359–367): 513–514. 1896. doi:10.1098/rspl.1896.0079.
"The Influence of a Magnetic Field on Radiation Frequency". Proceedings of the Royal Society of London60 (359–367): 514–515. 1896. doi:10.1098/rspl.1896.0080.