Recent Advances in Gravitational Lensing
  The gravitational lensing effect is one of the most promising tools for cosmology. Indeed it probes directly the total mass distribution in large-scale structures and can as well provide valuable informations on the values of the density parameter Omega and the cosmological constant lambda. In this review we summarize the most spectacular observational and theoretical advances obtained in this field during the last five years. 
Y. Mellier (Obs. Paris and IAP), L. van Waerbeke (Obs. Midi-Pyrenees),   F. Bernardeau (SPhT Saclay) & B. Fort (Obs. Paris)