BY analogy with the existence of both positive and negative electric charges, one may envisage the possibility of the existence of negative as well as positive mass. The non-appearance of such particles can be readily explained, but in at least one case the hypothesis leads to useful deductions.
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CHARLESBY, A. Structure of the Photon. Nature 155, 304–305 (1945). https://doi.org/10.1038/155304a0
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