@article{TAC_2006_16_a19,
     author = {John W. Barrett and Marco Mackaay},
     title = {Categorical representations of categorical groups},
     journal = {Theory and applications of categories},
     pages = {529--557},
     publisher = {mathdoc},
     volume = {16},
     year = {2006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAC_2006_16_a19/}
}