@article{VMUMM_1986_5_a2,
     author = {V. V. Kozlov and E. M. Nikishin},
     title = {A relativistic variant of the {Hamiltonian} formalism and wave functions of the hydrogen atom},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {11--20},
     publisher = {mathdoc},
     number = {5},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1986_5_a2/}
}