Astérisque, published by the Société Mathématique de France, consists of long papers of high quality, lecture notes, and conference or seminar proceedings. It is sold in the current year as separate issues or as a journal subscription. The AMS distributes Astérisque in the United States, Canada, and Mexico. Orders from other countries should be sent to the SMF, Maison de la SMF, case 916-Luminy-F-13288 Marseille cedex 09, France, or to Institut Henri Poincaré, 11 rue Pierre et Marie Curie, 75231 Paris cedex 05, France. Members of SMF may purchase single back issues at a 30% discount from list price. (ISSN 0303-1179) Softcover.