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K. G. Chetyrkin, B. A. Kniehl and M. Steinhauser, Nucl. Phys. B 510
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M. Kramer, E. Laenen and M. Spira, Nucl. Phys. B 511
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K. Agashe, R. Contino and A. Pomarol, Nucl. Phys. B 719
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Cited alongside, same era.
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Cited alongside, same era.
Y. Schroder and M. Steinhauser, JHEP 0601
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2006
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Cited alongside, same era.