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Wiki information Khvolson:

Orest Khvolson
Physicist, Person, Name source, Deceased Person

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 Chwolson
Author, Deceased Person, Person

Daniel Abramovich Chwolson or Chwolsohn or Khvolson – March 23 1911 [O.S. March 12] was a Russian-Jewish orientalist.