@article{SIGMA_2006_2_a28,
     author = {A. Duviryak},
     title = {Large-$j$ {Expansion} {Method} for {Two-Body} {Dirac} {Equation}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2006},
     volume = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2006_2_a28/}
}