1. Participation and Predication in Plato's Middle Dialogues;R E Allen;The Philosophical Review,1960
2. Category Theory
3. The Iterative Conception of Set;George Boolos;The Journal of Philosophy,1971
4. General Theory of Natural Equivalences;S Eilenberg;Transactions of the American Mathematical Society,1945
5. Sheaves of Structures and Generalized Ultraproducts;David Ellerman;Annals of Mathematical Logic,1974