Cultural relations between Greeks and Bulgarians from the middle of the XVth to the middle of the XIXth c. : 1. Greek-Bulgarian symposium organized in Thessaloniki (22-25 September 1978) by the "Institute for Balkan studies" in Thessaloniki and the "Institut za balkanistika pri BAN" in Sofia = Pneumatikes kai politistikes scheseis Helle?no?n kai Boulgaro?n apo ta mesa tou 15 heo?s ta mesa tou 19 aio?na : 1. Helle?noboulgariko symposio ... = Kulturni i literaturni otnos?enija mez?du ga?rci i ba?lgari ot sredata na XV do sredata na XIX vek : 1. Gra?cko-ba?lgarski simpozium ...