%0 Journal Article %A V. Ya. Ivrii %T Estimates for the spectrum of the Dirac operator %J Doklady Akademii Nauk %D 1987 %P 1298-1302 %V 297 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1987_297_6_a2/ %G ru %F DAN_1987_297_6_a2