Einstein, A. (1922) Ether and the Theory of Relativity. 5th May 1920 at the University of Leiden, Holland. Methuen & Co. Ltd., London.
http://www-history.mcs.st-andrews.ac.uk/Extras/Einstein_ether.html

has been cited by the following article:

• TITLE: Spacetime as a New Frontier Advanced Material with Applications in Physics, Engineering, Chemistry and Cosmology

  AUTHORS: Mohamed S. El Naschie

  KEYWORDS: N Tesla’s Aether, Einstein’s Aether

  JOURNAL NAME: Advances in Materials Physics and Chemistry, Vol.7 No.9, September 14, 2017

  ABSTRACT: A Letter to the Editor.