Affiliation: | 1. LRI, CNRS AND UNIVERSITY PARIS‐SUD, ORSAY CEDEX, FRANCE;2. NTIS ‐ NEW TECHNOLOGIES FOR THE INFORMATION SOCIETY, FACULTY OF APPLIED SCIENCES, UNIVERSITY OF WEST BOHEMIA, PLZE?, CZECH REPUBLIC;3. UNIV. BORDEAUX, LABRI, TALENCE, FRANCE;4. CNRS LABRI, TALENCE, FRANCE |