%0 Journal Article %A V. S. Gerdjikov %A E. Kh. Khristov %T Expansions in products of solutions of two Dirac systems %J Matematičeskie zametki %D 1980 %P 501-512 %V 28 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZM_1980_28_4_a2/ %G ru %F MZM_1980_28_4_a2