1. Variation through enrichment;Betti;J. Pure Appl. Algebra,1983
2. Two-dimensional monad theory;Blackwell;J. Pure Appl. Algebra,1989
3. Lokal präsentierbare Kategorien;Gabriel,1971
4. G-categories;Gordon;Memoirs Amer. Math. Soc.,1993
5. R. Gordon, A.J. Power, Algebraic structure for categories enriched over bicategories, J. Pure Appl. Algebra, to appear.