Введение к: Hawking S.Hawking on the Big Bang and Black Holes, p. 1.
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Catherine de Lange, ‘The man who saves Stephen Hawking’s voice’, New Scientist, 30 December 2011, http://www.newscientist.com/article/dn21323-the-man-who-savesstephen-hawkings-voice.html#.Ul61Phb3A