Politicheska geografiı︠a︡ na srednovekovnata bulgarska durzhava
Koledarov, Petur.
Sofiia Izd-vo na bulgarskata akademiia na naukite
1979-1989.
At head of title: Bulgarska akademiı︠a︡ na naukite, Institut za istoriı︠a︡
Added titles in English and Russian
Includes bibliographical references and indexes