%0 Journal Article %A E. L. Shishkina %T General Euler--Poisson--Darboux equation and hyperbolic $B$-potentials %J Contemporary Mathematics. Fundamental Directions %D 2019 %P 157-338 %V 65 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMFD_2019_65_2_a0/ %G ru %F CMFD_2019_65_2_a0