Decoration techniques and motifs of the late Roman and early Byzantine ceramics. Fine wares in Scythia Minor, 4th - 6th century A.D - Opriş, I.I.C (Der Limes an der unteren Donau von Diokletian bis Heraklios. Vorträge der internationalen Konferenz, Svištov 1. - 5. September 1998)