in 1930 vallee poussin was revising his 1916 tract lebesgue integrals: set functions: baire classes when luzin 's lectures on analytic sets and their applications was published.
Repeat this setence, but with the correct capitalization.
In 1930 Vallee Poussin was revising his 1916 tract Lebesgue integrals: Set functions: Baire classes when Luzin 's Lectures on analytic sets and their applications was published.