Erwin Finlay-Freundlich

Erwin Finlay-Freundlich (; 29 May 1885 – 24 July 1964) was a German astronomer, a pupil of Felix Klein. Freundlich was a working associate of Albert Einstein and introduced experiments for which the general theory of relativity could be tested by astronomical observations based on the gravitational redshift. Provided by Wikipedia
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1
by Freundlich, Erwin
Published 1920
Springer Berlin Heidelberg
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2
by Freundlich, Erwin
Published 1916
Springer Berlin Heidelberg
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3
by Freundlich, Erwin Finlay, Einstein, Albert
Published 1917
Springer Berlin Heidelberg