@article{CTGDC_2011__52_3_209_0,
     author = {Kenney, Toby and Pare, Robert},
     title = {Categories as monoids in {Span,} {Rel} and {Sup}},
     journal = {Cahiers de Topologie et G\'eom\'etrie Diff\'erentielle Cat\'egoriques},
     eid = {3},
     pages = {209--240},
     publisher = {Andr\'ee CHARLES EHRESMANN},
     volume = {52},
     number = {3},
     year = {2011},
     mrnumber = {2866504},
     zbl = {1242.18003},
     language = {en},
     url = {http://www.numdam.org/item/CTGDC_2011__52_3_209_0/}
}