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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
. 1963 Jan;49(1):19–20. doi: 10.1073/pnas.49.1.19

RELATIVE HOMOLOGICAL ALGEBRA MADE ABSOLUTE*

Peter Freyd 1
PMCID: PMC300620  PMID: 16591036

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