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by Hawking, Stephen W.
by Hawking, Lucy; Hawking, Stephen W.
by Penrose, Roger; Hawking, Stephen W.
by Hawking, Stephen W.; Pineda, Eloy
by Hawking, Stephen W.; Hawking, Lucy; Padilla, Silvia Pons
by Hawking, Stephen W.; Hawking, Lucy; De Dios, Laura Martin