Columbia subject headings:
Tikhonov, Nikolaĭ, 1896-1979--Bibliography.
Harvard subject headings:
Tikhonov, Nikolaĭ, 1896-1979--Bibliography.
Tikhonov, Nikolaĭ Semenovich, 1896---Bibliography.
Princeton subject headings:
Tikhonov, Nikolaĭ, 1896-1979--Bibliography.