"Yakov Il'ich Frenkel (Russian: Яков Ильич Френкель; 10 February 1894 – 23 January 1952) was a Soviet physicist renowned for his works in the field of ...
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condensed-matter physics. He is also known as Jacov Frenkel, frequently using the name J. Frenkel in publications in English." - (en.wikipedia.org 03.07.2024)