@article{MM2_1974__12_154232,
     author = {Volker Puppe},
     title = {A {Remark} on },
     journal = {Manuscripta mathematica},
     pages = {113--120},
     publisher = {mathdoc},
     volume = {12},
     year = {1974},
     zbl = {0277.55015},
     url = {http://geodesic.mathdoc.fr/item/MM2_1974__12_154232/}
}