@article{MM2_1973__9_154171,
     author = {Jens-Uwe Mertens},
     title = {Exakte {Paare} und {Kettenkomplexe.}},
     journal = {Manuscripta mathematica},
     pages = {357--374},
     publisher = {mathdoc},
     volume = {9},
     year = {1973},
     zbl = {0258.18002},
     url = {http://geodesic.mathdoc.fr/item/MM2_1973__9_154171/}
}