Columbia subject headings:
Slavic languages--Aspect--Congresses.
Slavic languages--Verb phrase--Congresses.
Harvard subject headings:
Slavic languages--Aspect--Congresses.
Slavic languages--Modality--Congresses.
Slavic languages--Verb phrase--Congresses.
Princeton subject headings:
Slavic languages--Aspect--Congresses.
Slavic languages--Modality--Congresses.
Slavic languages--Verb phrase--Congresses.