Bulgarian Academy of Sciences : reference book /
Bŭlgarska akademii︠a︡ na naukite.cn
Manova, Nadi︠a︡.
Momchilova, Emilii︠a︡.
Sofia : Publishing House of the Bulgarian Academy of Sciences,
1980.
Includes index.
Bŭlgarska akademii︠a︡ na naukite
Research institutes