2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/35794We discuss special supersymmetric extreme black holes in 4 and 5 dimensions which have regular horizons, non-zero entropy and can be interpreted as compactifications of BPS bound states of p-branes in 10 or 11 dimensions.6 pages, latex. Talk presented at the Second Sakharov Conference on Physics, Moscow, May 20-24, 1996General Relativity and Quantum CosmologyHigh Energy Physics - Theorytext