Columbia subject headings:
Harvard subject headings:
Classical philology--Congresses.
Indo-European languages--Congresses.
Princeton subject headings:
Classical philology.
Indo-European languages--Aspect.
Stepanov, I︠U︡riĭ Sergeevich, doktor filologicheskich nauk.
Tronskiĭ, I. M. (Iosif Moiseevich)