Slavi︠a︡nite i sredizemnomorskii︠a︡t svi︠a︡t VI-XI vek : mezhdunaroden simpozium po slavi︠a︡nska arkheologii︠a︡, Sofii︠a︡, 23-29 april 1970 = Les slaves et le monde méditerranéen, VIe-XIe siècles : Symposium international d'archéologie slave, Sofia, 23-29 avril 1970
Author
Mezhdunaroden simpozium po slavi︠a︡nska arkheologii︠a︡ (1970 : Sofia, Bulgaria)
Problemi za geografii︠a︡ta na naselenieto i selishtata : [Sb. dokl. ot simpozium "Problemi na geografii︠a︡ta na naselenieto i selishtata". Varna, 1971]
Author
Simpozium Problemi na geografii︠a︡ta na naselenieto i selishtata (1971 : Druzhba, Bulgaria)
Trudy XIII Mezhdunarodnogo kongressa po istorii nauki : Moskva, 18-24 avgusta 1971 g. = Actes du XIIIe Congrès international d'histoire des sciences, Moscou, 18-24 août, 1971 = Proceedings of XIIIth International Congress of the history of science, Moscow, Aug. 18-24, 1971 = Beiträge zum XIII Internationalen Kongress für Geschichte der Wissenschaft, Moskau, 18-24 August, 1971
Author
International Congress on the History of Sciences (13th : 1971 : Moscow, Russia)
Konstantin-Kiril filosof : materiali ot nauchnite konferent︠s︡ii po sluchaĭ 1150-godishninata ot rozhdenieto mu--Veliko Tŭrnovo, 19-11. XI. 1977 g., i Rim, 12-13. XII. 1977 g.
Author
[redakt︠s︡ionna kolegii︠a︡ E. Georgiev and others]
Liturgii︠a︡, arkhitektura i iskusstvo vizantiĭskogo mira : trudy XVIII Mezhdunarodnogo kongressa vizantinistov, Moskva, 8-15 avgusta 1991, i drugie materialy, posvi︠a︡shchennye pami︠a︡ti O. Ioanna Meĭendorfa