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\newblock homalg -- {A} {M}eta-{P}ackage for {H}omological {A}lgebra.
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\newblock With an appendix by David A. Buchsbaum, Reprint of the 1956 original.

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\newblock Springer-Verlag, New York, second edition, 1997.

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\bibitem[Rot79]{rot}
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\newblock Academic Press Inc. [Harcourt Brace Jovanovich Publishers], New York,
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