@article{MM2_1974__12_154242,
     author = {Basil A. Rattray},
     title = {Torsion {Theories} in {Non-Additive} {Categories.}},
     journal = {Manuscripta mathematica},
     pages = {285--306},
     publisher = {mathdoc},
     volume = {12},
     year = {1974},
     zbl = {0283.18002},
     url = {http://geodesic.mathdoc.fr/item/MM2_1974__12_154242/}
}