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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1958 Jul 15;44(7):695–698. doi: 10.1073/pnas.44.7.695

SPACES FOR WHICH THE RICCI SCALAR R IS EQUAL TO ZERO

Luther P Eisenhart 1
PMCID: PMC528645  PMID: 16590261

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