1. THE SPECIES ABUNDANCES DISTRIBUTION IN A NEUTRAL COMMUNITY MODEL. Authors: ZOLTÁN NÉDA, MÁRIA RAVASZ, ADALBERT BALOG, ARANKA DERZSI.2. CROSS-CORRELATIONS IN THE BROWNIAN MOTION OF COLLOIDAL NANOPARTICLES. Authors: SZ. KELEMEN, L. VARGA, ZOLTÁN NÉDA.