Hawking S.Black Holes in General Relativity. Communications in Mathematical Physics 25 (1972), pp. 152–166.
96
Larsen, p. 54.
97
Hawking S.Sixty Years in a Nutshell, p. 111.
98
Hawking S. Ph. D. thesis. University of Cambridge, March 1966.
99
Hawking S. and Penrose R.The Singularities of Gravitational Collapse and Cosmology. Proceedings of the Royal Society of London A314 (1970), pp. 529–548.