Columbia subject headings:
Pi︠a︡tnit︠s︡kiĭ, O. (Osip), 1882-1939.
Harvard subject headings:
Pi͡atnit͡skiĭ, O. (Osip), 1882-1939.
Princeton subject headings:
Pi︠a︡tnit︠s︡kiĭ, O. (Osip), 1882-1939.