On Schwinger’s variational principle
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Publication:3845107
DOI10.1098/rspa.1957.0218zbMath0108.41302OpenAlexW2091321463MaRDI QIDQ3845107
John Polkinghorne, Tom W. B. Kibble
Publication date: 1957
Published in: Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences (Search for Journal in Brave)
Full work available at URL: https://doi.org/10.1098/rspa.1957.0218
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