%0 Journal Article %A M. I. Kliot-Dashinskii %T On the rate of convergence of the Trefftz variational method for the first boundary problem of an equation of polyharmonic type %J Izvestiâ vysših učebnyh zavedenij. Matematika %D 1958 %P 163-172 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/IVM_1958_2_a13/ %G ru %F IVM_1958_2_a13