%0 Journal Article %A A. E. Lifshits %T Weakly connected systems with nonpropagating waves %J Funkcionalʹnyj analiz i ego priloženiâ %D 1984 %P 67-68 %V 18 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/FAA_1984_18_2_a12/ %G ru %F FAA_1984_18_2_a12