Poemy Bloka i russkai︠a︡ Poema kont︠s︡a XIX - nachala XX vekov /
Academy of Sciences of the Union of Soviet Socialist Republics (Moscow). - Institute of Russian Literature (Pushkin House)
Dolgopolov, L. K.(Leonid Konstantinovich)
Muratova, Ksenii︠a︡ Dmitrievna.
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