1. Abstract and Concrete Categories;Adámek,1990
2. The duality of distributive σ-continuous lattices;Banaschewski,1979
3. B. Banaschewski, σ-frames, unpublished manuscript, 1980, available at http://mathcs.chapman.edu/CECAT/members/Banaschewski_publications.
4. Realcompactness and the cozero part of a frame;Banaschewski;Appl. Categ. Struct.,2001
5. σ-Spaces and σ-Frames;Clarke,2006