The collected works of Leo Szilard : scientific papers - Szilard, Leo; Feld, Bernard T.; Szilard, Gertrud Weiss; Winsor, Kathleen R.; Monod, Jacques; Eckart, Carl; Feld, Bernard T.; Goldhaber, Maurice; Novick, Aaron; Tabin, Julius (London, UK ; Cambridge, Mass : The MIT Press, 1972)