Burbidge, E. M., Burbidge, G. R., Fowler, W. A., and Hoyle, F., Revs. Mod. Phys., 29, 547 (1957).
The first, somewhat furtive, signal from element 63 was recorded in 1885 by Sir William Crookes, who found an anomalous red line (609 nm) in the emission spectrum of a samarium sample.
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