@article{PFMT_2012_4_a0,
     author = {V. V. Andreev and E. S. Chebotareva},
     title = {The search of critical parameter values for semirelativistic coulomb problem},
     journal = {Problemy fiziki, matematiki i tehniki},
     pages = {7--9},
     publisher = {mathdoc},
     number = {4},
     year = {2012},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PFMT_2012_4_a0/}
}