1. Fibring and sheaves.;Proceedings of IICAI-05, Special Session at the 2nd Indian International Conference on Artifial Intelligence,2005
2. On the category of algebraizable logics.;CLE e-Prints,2006
3. A global glance on categories in logic.;Logica Universalis,2007
4. Filter functors in logic and applications to categorial analysis of meta-logic properties.;in preparation