%0 Journal Article %A F. N. Garif'yanov %T Transformations of biorthogonal systems, and some of their applications. I. %J Izvestiâ vysših učebnyh zavedenij. Matematika %D 1996 %P 5-16 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/IVM_1996_6_a1/ %G ru %F IVM_1996_6_a1