Hadronic effects in leptonic systems: muonium hyperfine structure and   anomalous magnetic moment of muon
  Contributions of hadronic effects to the muonium physics and anomalous magnetic moment of muon are considered. Special attention is paid to higher-order effects and the uncertainty related to the hadronic contribution to the hyperfine structure interval in the ground state of muonium. 
S. I. Eidelman, S. G. Karshenboim, V. A. Shelyuto