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The online version of the original article can be found at http://dx.doi.org/10.1007/BF02813727
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Kovetz, A., Piran, Z. Erratum to: The efficiency of the penrose process. Lett. Nuovo Cimento 12, 560 (1975). https://doi.org/10.1007/BF02813753
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DOI: https://doi.org/10.1007/BF02813753