Russko-bolgarskie otnoshenii︡︠a /
Martynenko, A. K.(Anatoly Konstantinovich)
[Kiev] : Izd-vo Kievskogo universiteta,
1967-1974.
In cyrillic characters.
Includes bibliographical references.
[v. 1] 1894-1902 -- [v. 2] 1905-1907.