Proceedings : 6th International Conference on Operational Research, Rovinj, October, 1-3, 1996 = KOI'96 - Hunjak, Tihomir; Martić, Grgo; Neralić, Luka; Leopold-Wildburger, Ulrike; Derks, Jean; Peters, Hans; Rendl, Franz; Zlobec, Sanjo; Rückmann, Jan-J; Chamaret, B.; Ubeda, S.; Žerovnik, Janez, kemičar; et al. (Croatian Operational Research Society, 1996)