Columbia subject headings:
Ermakov, Vasiliĭ Petrovich.
Mathematicians--Soviet Union--Biography.
Harvard subject headings:
Ermakov, Vasiliĭ Petrovich, 1845-1922.
Mathematicians--Soviet Union--Biography
Princeton subject headings:
Ermakov, Vasiliĭ Petrovich, 1845-1922.
Mathematicians--Soviet Union--Biography.