1. Inštitut za matematiko, fiziko in mehaniko, Univerza v Ljubljani, Jadranska 19, 1000 Ljubljana, Slovenia, Resource Use Institute, 14 Lower Oakfield, Pitlochry, Perthshire PH16 5DS, Scotland, UK, The Rugjer Bošković Institute, Bijenička c. 54, HR-10001 Zagreb, POB. 1016, Croatia