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@article{MZ_1968__107_171056, author = {Ulrich Oberst}, title = {Homology of {Categories} and {Exactness} of {Direct} {Limits.}}, journal = {Mathematische Zeitschrift}, pages = {87--115}, publisher = {mathdoc}, volume = {107}, year = {1968}, zbl = {0176.28902}, url = {http://geodesic.mathdoc.fr/item/MZ_1968__107_171056/} }
Ulrich Oberst. Homology of Categories and Exactness of Direct Limits.. Mathematische Zeitschrift, Tome 107 (1968), pp. 87-115. http://geodesic.mathdoc.fr/item/MZ_1968__107_171056/