%0 Journal Article %A F. G. Avkhadiev %A L. I. Shokleva %T Generalizations of a~theorem of Beurling and their applications to inverse boundary value problems %J Izvestiâ vysših učebnyh zavedenij. Matematika %D 1994 %P 80-83 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/IVM_1994_5_a10/ %G ru %F IVM_1994_5_a10