Columbia subject headings:
Nikitin, S. A. (Sergeĭ Aleksandrovich), 1901-1979--Congresses.
Slavic countries--Study and teaching (Higher)--Soviet Union--Congresses.
Harvard subject headings:
Nikitin, Sergeĭ Aleksandrovich--Congresses.
Slavic countries--Study and teaching (Higher)--Soviet Union--Congresses.
Princeton subject headings:
Nikitin, Sergeĭ Aleksandrovich, 1901---Congresses.
Slavic countries--Study and teaching (Higher)--Soviet Union--Congresses.