1. Monadic decompositions;Adamek;J. Pure Appl. Algebra,1989
2. Iterated cotriples;Applegate,1970
3. J.C. Baez, The mysteries of counting: Euler characteristic versus homotopy cardinality, in: Talk at the Streetfest, Sydney, 2005
4. Categorification;Baez,1998
5. From finite sets to Feynman diagrams;Baez,2001