1. Normalization equivalence, kernel equivalence and affine categories;Bourn,1991
2. A functional approach to general topology;Clementino,2004
3. M.M. Clementino, D. Hoffman, G. Janelidze, On exponentiability of étale algebraic homomorphisms, Preprint 11-35, DMUC.
4. J.R.A. Gray, Algebraic exponentiation in general categories, Ph.D. Thesis, University of Cape Town, 2010.
5. J.R.A. Gray, Algebraic exponentiation in general categories, Applied Categorical Structures, in press (available online doi:10.1007/s10485-011-9251-6), 2011.