@article{AIHPA_1984__40_2_159_0,
     author = {Gesztesy, F. and Grosse, H. and Thaller, B.},
     title = {A rigorous approach to relativistic corrections of bound state energies for spin-1/2 particles},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {159--174},
     publisher = {Gauthier-Villars},
     volume = {40},
     number = {2},
     year = {1984},
     mrnumber = {747200},
     zbl = {0534.46053},
     language = {en},
     url = {http://archive.numdam.org/item/AIHPA_1984__40_2_159_0/}
}