Columbia subject headings:
Polish language--Aspect.
Polish language--Negatives.
Russian language--Aspect.
Russian language--Negatives.
Harvard subject headings:
Polish language--Aspect.
Polish language--Grammar, Comparative--Russian.
Polish language--Negatives.
Russian language--Aspect.
Russian language--Grammar, Comparative--Polish.
Russian language--Negatives.
Princeton subject headings:
Polish language--Aspect.
Polish language--Grammar, Comparative--Russian.
Polish language--Negatives.
Russian language--Aspect.
Russian language--Grammar, Comparative--Polish.
Russian language--Negatives.