Clusters of galaxies - proceedings of the XXIXth Rencontre de Moriond, XIVth Moriond astrophysics meetings, Méribel, Savoi, proceedings of the XXIXth Rencontre de Moriond, XIVth Moriond astrophysics meetings, Méribel, Savoie, France, March, 12-19, 1994
Alain Mazure, Jean Thanh Vân Trân`, Florence Durret