[108] Hulsizer and Lazarus, op, cit., p. 222.
[109] Misner, Thorne, and Wheeler, op. cit., p. 5.
[110] Pais, Abraham, op. cit., p. 288.
[111] Misner, Thorne, and Wheeler, op, cit., p. 543.
[56] Feynman, Richard, The Character of Physical Law, MIT Press, 1967, p. 39.
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