Dodd, J N; Fox, W N; Series, G W; Taylor, M J (1959). "Light Beats as Indicators of Structure in Atomic Energy Levels". Proceedings of the Physical Society. 74 (6): 789–791. Bibcode:1959PPS....74..789D. doi:10.1088/0370-1328/74/6/122.
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Dodd, J N; Fox, W N; Series, G W; Taylor, M J (1959). "Light Beats as Indicators of Structure in Atomic Energy Levels". Proceedings of the Physical Society. 74 (6): 789–791. Bibcode:1959PPS....74..789D. doi:10.1088/0370-1328/74/6/122.