INLS, UCSD, CMRR Building 9500 Gilman Drive, La Jolla, CA 92093 United States ; IPGP, University Denis Diderot, 4, Place Jussieu 75005, Paris, 75005 France
IUSTI, 5 rue E. Fermi, Technopole de Chateau-Gombert, Marseille, 13453 France
DMA, ENS, 45 rue d'Ulm, Paris, 75005 France
INRIA, Projet BANG, BP105, Le Chesnay, 78153 France
IPGP, University Denis Diderot, 4, Place Jussieu 75005, Paris, 75005 France