@article{ZNSL_1992_197_a1,
     author = {S. A. Vugal'ter and G. M. Zhislin},
     title = {On the discrete-spectrum of the given $SO(2)$ symmetry of many-particle systems with the potential field and the homogeneous magnetic field},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {28--41},
     publisher = {mathdoc},
     volume = {197},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1992_197_a1/}
}