1. Digital Lighting Functions;Ayala;Lecture Notes in Computer Science,1997
2. A Digital Index Theorem;Ayala;Proc. of the 7th Int. Workshop on Combinatorial Image Analysis, IWCIA'00,2000
3. Ayala R., E. Domínguez, A. R. Francés and A. Quintero, Weak Lighting Functions and Strong 26-surfaces, Theoretical Comptuer Science, To Appear.
4. Ayala R., E. Domínguez, A. R. Francés and A. Quintero, Homotopy in Digital Spaces, Discrete and Applied Mathematics, To Appear.
5. Domínguez E., and A. R. Francés, An Axiomatic Approach to Digital Topology, Lecture Notes in Computer Science, special issue on Digital and Image Geometry, to appear.