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Research conducted at international institutions 
- Université Paul Sabatier. Laboratory of Quantum Physics.

Toulouse (France), November-December 1996 and October-December 1997.
- Ecole Polytechnique Fédérale de Lausanne.

Lausanne (Switzerland), July 1996.
- University of California, Berkeley.

Berkeley, California (USA), August 1996.
- Universiteit van Amsterdam.

(Under the auspices of a Nuffic fellowship) Amsterdam (Holland), May-June 1996.
- University of California, Berkeley.

(Under the
auspices of Fulbright & International Institute Fellowship). Berkeley, California (USA), 1994.
- Western Ontario University.

London, Ontario (Canada), June 1994.
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