1. WebOntEx: Exracting Ontologies from Web Pages, Invited Keynote Address, JISBD'2000 (Journada de Ingenieria de Sistemas y Bases de Datos), Valladolid, Spain, November 2000.
   
2. Standards for Database Interoperability and Portability, Invited Keynote Address, ENC'99 (Segundo Encuentro de Computacion 99), Universidad Autonoma del Estado de Hidalgo, Pachuca, Hidalgo, Mexico, September 1999.
   
3. Temporal Databases, Invited Talk, CITA-95 (Congreso Internacional de Tecnologia y Applicaciones de Informatica), Catholic University of Paraguay, Asuncion, Paraguay, August 1995.
   
4. Object-Oriented Databases, Invited Talk, Conference on Advanced Information Technology, University of Nuevo Leon, Monterrey, Mexico, October 1994.
   
5. Recent Advances in Temporal Databases, Invited Keynote Address, Sixth Brazilian Database Symposium, Manaus, Brazil, May 1991.
   
6. Temporal Databases: The Next Frontier, Invited Keynote Address, Australian Annual Database Symposium, Sydney, Australia, January 1991.
   
7. Temporal Databases, Invited Talk, Conference on Computer Technologies, University of Monterrey, Monterrey, Mexico,October 1994.
   

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