1. B.E. Lautrup, On sixth-order radiative corrections to the muon g-factor, Nuovo Cim. A 64 (1969) 322 [ INSPIRE ].
2. B.E. Lautrup, A. Peterman and E. de Rafael, Recent developments in the comparison between theory and experiments in quantum electrodynamics, Phys. Rept. 3 (1972) 193 [ INSPIRE ].
3. G. Mishima, Bound state effect on the electron g-2, arXiv:1311.7109 [ INSPIRE ].
4. T. Aoyama, M. Hayakawa, T. Kinoshita and M. Nio, Proper eighth-order vacuum-polarization function and its contribution to the tenth-order lepton g-2, Phys. Rev. D 83 (2011) 053003 [ arXiv:1012.5569 ] [ INSPIRE ].
5. K. Melnikov, A. Vainshtein and M. Voloshin, Remarks on the effect of bound states and threshold in g-2, Phys. Rev. D 90 (2014) 017301 [ arXiv:1402.5690 ] [ INSPIRE ].