The point of the empty set
Barr, Michael
Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 13 (1972), p. 357-368 / Harvested from Numdam
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@article{CTGDC_1972__13_4_357_0,
     author = {Barr, Michael},
     title = {The point of the empty set},
     journal = {Cahiers de Topologie et G\'eom\'etrie Diff\'erentielle Cat\'egoriques},
     volume = {13},
     year = {1972},
     pages = {357-368},
     mrnumber = {323861},
     zbl = {0258.18003},
     language = {en},
     url = {http://dml.mathdoc.fr/item/CTGDC_1972__13_4_357_0}
}

Barr, Michael. The point of the empty set. Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 13 (1972) pp. 357-368. http://gdmltest.u-ga.fr/item/CTGDC_1972__13_4_357_0/

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(b) Exact categories, Lecture Notes in Math. 236 (1971), 1-20. | Zbl 0221.18006

G. Grätzer, Universal Algebra, D. Van Nostrand & Co., 1968. | MR 248066 | Zbl 0182.34201

S. Mac Lane, Categories for the Working Mathematician, Springer-Verlag 1971. | MR 354798 | Zbl 0232.18001