Columbia subject headings:
T͡Skhakai͡a, Mikhail Grigorʹevich, 1865-1950.
Harvard subject headings:
T︠S︡khakai︠a︡, Mikhail Grigorʹevich, 1865-1950.
Princeton subject headings:
T︠S︡khakai︠a︡, Mikhail Grigorʹevich, 1865-1950.