%0 Journal Article %A M. F. Atiyah %A R. Bott %A L. GÄrding %T Lacunas for hyperbolic differential operators with constant coefficients.~II. %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 1984 %V 39 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/RM_1984_39_3_a18/ %G ru %F RM_1984_39_3_a18