%0 Journal Article %A V. L. Vaskevich %T Numerical analysis of the energy zone structure of a crystal with a poly-atomic elementary cell %J Matematičeskie trudy %D 1992 %P 55-91 %V 22 %I mathdoc %U http://geodesic.mathdoc.fr/item/MT_1992_22_a3/ %G ru %F MT_1992_22_a3