At head of title, v. 1- : Institut balkanistiki Bolgarskoĭ akademii nauk. Mezhdunarodnai︠a︡ assot︠s︡ii︠a︡t︠s︡ii︠a︡ po izuchenii︠u︡ i rasprostranenii︠u︡ slavi︠a︡nskikh kulʹtur.
1. IX-XVII vv.
Includes bibliographical references.
Contributions in Bulgarian, French, German, or Russian; table of contents also in French.