1. H. Herrlich, Regular categories and regular functors, Canad. J. Math. 26(1974) 709–720.
2. H. Herrlich, Topological functors, Gen. Topology and Appl. 4 (1974) 125–142.
3. H. Herrlich, G. Salicrup and R. Vázquez, Dispersed factorization structures, Preprint.
4. H. Herrlich and G. E Strecker, Category Theory, Boston Allyn and Bacon 1973.
5. H. Herrlich and G. E. Strecker, Semi-universal maps and universal initial completions, Preprint.