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On the speed of the invisible portions of the spectrum

Paul R. Heyl
1907 Journal of the Franklin Institute  

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doi:10.1016/s0016-0032(07)90069-1 fatcat:a3fgaglddjcs7mdvsdyja6cho4
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Paul R. Heyl. "On the speed of the invisible portions of the spectrum." Journal of the Franklin Institute 164.2 (1907) 81-112