Belorussiı︠a︡ i Bolgariı︠a︡ : druzhba vechnaı︠a︡ nerushimaı︠a︡, 681-1981 Belorusiı︠a︡ i Bulgariı︠a︡ : druzhba. vechna, nerushima, 681-1981 /
Melʹtser, D. B.
Minsk Izd-vo BGU im. V.I. Lenina
1981
Includes bibliographical references