SRL for [fission]: Nuclear [fission] of heavy elements was discovered on December 17 , 1938 by German Otto Hahn and his assistant Fritz Strassmann , and explained theoretically in January 1939 by Lise Meitner and her nephew Otto Robert Frisch . Frisch named the process by analogy with biological fission of living cells .
ARG-4: Nuclear | ARG-1: of heavy elements