@article{TAC_2015_30_a14,
     author = {Marie Bjerrum and Peter Johnstone and Tom Leinster and William F. Sawin},
     title = {Notes on commutation of limits and colimits},
     journal = {Theory and applications of categories},
     pages = {527--532},
     publisher = {mathdoc},
     volume = {30},
     year = {2015},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAC_2015_30_a14/}
}