1. Toposes, Triples and Theories;Barr,1985
2. Fibred categories and the foundations of naive category theory;Bénabou;J. Symbolic Logic,1985
3. Relating categorical approaches to type dependency;Blanco,1991
4. A survey of the project AUTOMATH;de Bruijn,1970
5. Generalized algebraic theories and contextual categories;Cartmell,1978