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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
. 1967 Oct;58(4):1768–1773. doi: 10.1073/pnas.58.4.1768

Some desirable modifications of the international symmetry symbols.

M J Buerger
PMCID: PMC223993  PMID: 5237902

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