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Física. — Espacio-tiempo. — Penrose (Sir Roger) «Gravitational Collapse and Space-Time Singularities», en *Physical Review Letters*, vol. 14, n.º 13, pp. 57-59, 1965; «Un enfoque de la radiación gravitatoria mediante un método de coeficientes de espín», en *Journal of Mathematical Physics*, vol. 3, pp. 566-578, 1962; «Una propiedad notable de las ondas planas en la relatividad general», en Reviews of Modern Physics, vol. 37, pp. 215-220, 1965; «Álgebra de twistores», en Journal of Mathematical Physics, vol. 8, pp. 345-366, pequeño agujero en la página 365 que afecta a una palabra, 1967, ejemplares procedentes de biblioteca con sellos de tinta, encuadernación en tela o semitela, la mayoría con etiqueta de papel en el lomo, ligeros roces en los extremos, Nueva York, 4to(4) *** Artículos fundamentales de Sir Roger Penrose y sus colaboradores, que redefinieron la relatividad general, la teoría de los agujeros negros, la radiación gravitatoria y la estructura geométrica del espacio-tiempo.
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