@article{TAC_2021_37_a28,
     author = {Ross Street},
     title = {Variation on a comprehensive theme},
     journal = {Theory and applications of categories},
     pages = {964--978},
     publisher = {mathdoc},
     volume = {37},
     year = {2021},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAC_2021_37_a28/}
}