%0 Journal Article %A A. G. Baskakov %A E. E. Dikarev %T Spectral theory of functions in studying partial differential operators %J Ufa mathematical journal %D 2019 %P 3-18 %V 11 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/UFA_2019_11_1_a0/ %G en %F UFA_2019_11_1_a0