"...theenergytensorcanberegardedonlyasaprovisionalmeansofrepresentingmatter.Inreality,matterconsistsofelectricallychargedparticles...."3
DOI:https://doi.org/10.1103/RevModPhys.21.425
©1949 American Physical Society
John Archibald Wheeler and Richard Phillips Feynman
Vol. 21, Iss. 3 — July - September 1949
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