@article{10_4171_dm_191,
     author = {D.H. Jakubassa-Amundsen},
     title = {The projected single-particle {Dirac} operator for {Coulombic} potentials},
     journal = {Documenta mathematica},
     pages = {331--356},
     year = {2005},
     volume = {10},
     doi = {10.4171/dm/191},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/dm/191/}
}