%0 Journal Article %A Yu. Sh. Abramov %T Some problems on the eigenvalues of the equation $Tu=\lambda Su$ with unbounded and nonsymmetric operators, and their applications %J Izvestiâ vysših učebnyh zavedenij. Matematika %D 1973 %P 3-14 %N 11 %I mathdoc %U http://geodesic.mathdoc.fr/item/IVM_1973_11_a0/ %G ru %F IVM_1973_11_a0