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Achúcarro, A., Gong, JO., Hardeman, S. et al. Effective theories of single field inflation when heavy fields matter. J. High Energ. Phys. 2012, 66 (2012). https://doi.org/10.1007/JHEP05(2012)066
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DOI: https://doi.org/10.1007/JHEP05(2012)066