@article{GDZPPN002217333, title = {Exakte Paare und Kettenkomplexe.}, journal = {Manuscripta mathematica}, volume = {11}, year = {1973}, pages = {357-374}, zbl = {0258.18002}, url = {http://dml.mathdoc.fr/item/GDZPPN002217333} }
Mertens, Jens-Uwe. Exakte Paare und Kettenkomplexe.. Manuscripta mathematica, Tome 11 (1973) pp. 357-374. http://gdmltest.u-ga.fr/item/GDZPPN002217333/