%0 Journal Article %A G. M. Vainikko %T On the rate of convergence of certain approximation methods of Galerkin type in eigenvalue problems %J Izvestiâ vysših učebnyh zavedenij. Matematika %D 1966 %P 37-45 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/IVM_1966_2_a5/ %G ru %F IVM_1966_2_a5