%0 Journal Article %A G. M. Zhislin %T On the finiteness of the discrete spectrum of the energy operator of negative atomic and molecular ions %J Teoretičeskaâ i matematičeskaâ fizika %D 1971 %P 332-341 %V 7 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/TMF_1971_7_3_a4/ %G ru %F TMF_1971_7_3_a4