1. See, for example, talks by Satz, Matsui, Tannenbaum, Kluberg, Stock, and Cappella in these proceedings.
2. W. Busza and R. Ledoux, To be published in Ann. Rev. Nucl. Part. Phys.
3. Absorption cross section of π±, K±, p and on nuclei between 60 and 280 GeV/c