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MR439004 (55 #11905) 81.53
Penrose, Roger Nonlinear gravitons and curved twistor theory. The riddle of gravitation--on the occasion of the 60th birthday of Peter G. Bergmann (Proc. Conf., Syracuse Univ., Syracuse, N. Y., 1975). General Relativity and Gravitation 7 (1976), no. 1, 31--52.
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