@article{IM2_2002_66_1_a3,
     author = {G. M. Zhislin and S. A. Vugal'ter},
     title = {On the discrete spectrum of {Hamiltonians} for pseudo-relativistic electrons},
     journal = {Izvestiya. Mathematics },
     pages = {71--102},
     publisher = {mathdoc},
     volume = {66},
     number = {1},
     year = {2002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2002_66_1_a3/}
}