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Kehrein, Achim
Projective objects in the category of chain complexes. (English). Acta Mathematica et Informatica Universitatis Ostraviensis, vol. 7 (1999), issue 1, pp. 33-38
MSC: 18G05, 18G35 | MR 1724077 | Zbl 1022.18008
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[3] A. Dold: Zur Homotopietheorie der Kettenkomplexe. Math. Annalen 140 (1960), 278-298. DOI 10.1007/BF01360307 | MR 0112906 | Zbl 0093.36903
[4] S. Katayama: On Homotopy Classes of Cochain Maps. Proc. Japan Acad. 61 Ser. A (1985), 147-148. MR 0804353 | Zbl 0583.18005
[5] S. MacLane: Homology. Springer, Berlin, 1963. MR 0156879 | Zbl 0133.26502
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