@article{AIHPA_1990__53_1_109_0,
     author = {White, Gregory B.},
     title = {Splitting of the {Dirac} operator in the nonrelativistic limit},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {109--121},
     publisher = {Gauthier-Villars},
     volume = {53},
     number = {1},
     year = {1990},
     mrnumber = {1077468},
     zbl = {0712.35082},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1990__53_1_109_0/}
}