Proceedings of an NEA Workshop on Near-Field Assessment of Repositories for Low and Medium Level Radioactive Waste = Compte rendu d'une r?union de travail de l'AEN sur l'?valuation du champ proche des d?p?ts de d?chets radioactifs de faible et moyenne activit? : Baden, Switzerland, 23-25 Nov. 1987 = Baden, Suisse, 23-25 Nov. 1987 / organised jointly by Nuclear Energy Agency, National Cooperative for the Storage of Radioactive Waste, NAGRA, Switzerland