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Wiki information Khvolson:
Orest Danilovich Khvolson or Chwolson was a Russian physicist and honorary member of the Soviet Academy of Sciences. He is most noted for being one of the first to study the gravitational lens effect. Orest, son of the noted Orientalist Daniel...
Daniel Abramovich Chwolson or Chwolsohn or Khvolson – March 23 1911 [O.S. March 12] was a Russian-Jewish orientalist.