an Entity references as follows:
Grigorii Mikhailovich Fichtenholz (or Fikhtengolts) (Russian: Григо́рий Миха́йлович Фихтенго́льц) (June 8, 1888 in Odessa – June 26, 1959 in Leningrad) was a Soviet mathematician working on real analysis and functional analysis. Fichtenholz was one of the founders of the Leningrad school of real analysis. He was an Invited Speaker of the ICM in 1924 in Toronto. Leonid Kantorovich and Isidor Natanson were among his students.