TY - JOUR AU - Fernández-Rañada, Antonio PY - 1977 DO - 10.1007/BF01807613 SN - 0020-7748 UR - https://hdl.handle.net/20.500.14352/64911 T2 - International Journal of Theoretical Physics AB - The effect of nonlinear terms in the Dirac equation is investigated, in the case of the hydrogen atom. It is found that the change in the energy is of order α6 for a very large range of values of the coupling constant of the dominant term. It is shown... M2 - 795 PB - Plenum TI - Relativistic quantum mechanics of hydrogen atom as weak-field limit of a nonlinear theory TY - journal article VL - 16 ER -