@article{TAC_2008_20_a3,
     author = {Dominique Bourn},
     title = {Abelian groupoids and non-pointed additive categories},
     journal = {Theory and applications of categories},
     pages = {48--73},
     publisher = {mathdoc},
     volume = {20},
     year = {2008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAC_2008_20_a3/}
}