A. Connes, College de France, Paris, France, and Institut des Hautes Etudes Scientifiques, Bures-sur-Yvette, France.C. Consani, Johns Hopkins University, Baltimore, MD.B. I. Dundas, University of Bergen, Norway.M. Khalkhali, Western University, London, ON, Canada.H. Moscovici, The Ohio State University, Columbus, OH.