1. On locally simply connected toposes and their fundamental groups;Barr;Cahiers de Top. et Géom. Diff. Catégoriques,1981
2. Molecular toposes;Barr;J. Pure Appl. Alg.,1980
3. Stack completions and Monta equivalence for categories in a topos;Bunge;Cahiers de Top. et Géom. Diff. Catégoriques,1979
4. Cosheaves and distributions on toposes;Bunge;Algebra Universalis,1995
5. The symmetric topos;Bunge;J. Pure Appl. Alg.,1995