@article{TAC_2008_20_a7,
     author = {Marco Grandis and Robert Par\'e},
     title = {Kan extensions in double categories {
(On} weak double categories, {Part} {III)}},
     journal = {Theory and applications of categories},
     pages = {152--185},
     publisher = {mathdoc},
     volume = {20},
     year = {2008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAC_2008_20_a7/}
}