Fernández-Rañada, Antonio2023-06-212023-06-211973-11-150556-282110.1103/PhysRevD.8.3430https://hdl.handle.net/20.500.14352/64918© 1973 The American Physical Society. We wish to thank Dr. B. Carreras for his help in clarifying several points of this paper through numer ous discussions.A nonlinear spinor field is studied interacting at rest with the static radial electromagnetic potential, c4 p. The results of perturbation theory fully agree with the exact results previously obtained.engjournal articlehttp://dx.doi.org/10.1103/PhysRevD.8.3430http://journals.aps.orgopen access537ElectricidadElectrónica (Física)2202.03 Electricidad