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369
13. A. Sen, Subleading soft graviton theorem for loop amplitudes. J. High Energy Phys. 2017(11)
(2017). https://doi.org/10.1007/JHEP11(2017)123. arXiv: 1703.00024
14. A. Sen, Wilsonian effective action of superstring theory. J. High Energy Phys. 2017(1), 108
(2017). https://doi.org/10.1007/JHEP01(2017)108. arXiv: 1609.00459
15. E. Witten, The Feynman i in string theory (2013). arXiv: 1307.5124