@article{MZ_1965__87_170379,
     author = {Alex Heller},
     title = {Homological functors.},
     journal = {Mathematische Zeitschrift},
     pages = {283--298},
     publisher = {mathdoc},
     volume = {87},
     year = {1965},
     zbl = {0124.01503},
     url = {http://geodesic.mathdoc.fr/item/MZ_1965__87_170379/}
}