Stephen Hawking's 1966 Adams Prize Essay.Published in:European Physical Journal H, 2014, v. 39, n. 4, p. 403, doi. 10.1140/epjh/e2014-50014-xBy:Ellis, George F.R.Publication type:Article
Singularities and the geometry of spacetime.Published in:European Physical Journal H, 2014, v. 39, n. 4, p. 413, doi. 10.1140/epjh/e2014-50013-6By:Hawking, StephenPublication type:Article