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An erratum to this article is available at http://dx.doi.org/10.1007/BF02813753.
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Kovetz, A., Piran, T. The efficiency of the Penrose process. Lett. Nuovo Cimento 12, 39–42 (1975). https://doi.org/10.1007/BF02813727
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DOI: https://doi.org/10.1007/BF02813727