@article{TAC_2021_37_a0,
     author = {Marino Gran and James Richard Andrew Gray},
     title = {Action representability of the category of internal groupoids},
     journal = {Theory and applications of categories},
     pages = {1--13},
     year = {2021},
     volume = {37},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAC_2021_37_a0/}
}