Categories as monoids in Span, Rel and Sup
Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 52 (2011) no. 3, article no. 3, 32 p. 
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Kenney, Toby; Pare, Robert. Categories as monoids in Span, Rel and Sup. Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 52 (2011) no. 3, article  no. 3, 32 p. http://www.numdam.org/item/CTGDC_2011__52_3_209_0/

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