%0 Journal Article %A A. L. Belopol'skii %T Scattering problems for two spaces with an unbounded identification operator %J Funkcionalʹnyj analiz i ego priloženiâ %D 1971 %P 77-78 %V 5 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/FAA_1971_5_2_a7/ %G ru %F FAA_1971_5_2_a7