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Metcalfe, E. P. and Venkatesachar, B. (1929) Selective absorption by excited mercury vapour. Nature, 123 (3107). p. 761.
Metcalfe, E. P. and Venkatesachar, B. (1925) The Origin of the Satellites of Mercury Lines. Nature, 115 (2879). pp. 15-16.