The Lamb shift of the 1s state in hydrogen: Two-loop and three-loop contributions

@article{Karshenboim2019TheLS,
  title={The Lamb shift of the 1s state in hydrogen: Two-loop and three-loop contributions},
  author={Savely G. Karshenboim and Akira Ozawa and Valery A. Shelyuto and Robert Szafron and Vladimir G. Ivanov},
  journal={Physics Letters B},
  year={2019}
}

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