%0 Journal Article %A K. B. Sabitov %A R. M. Safina %T The first boundary-value problem for an equation of mixed type with a~singular coefficient %J Izvestiya. Mathematics %D 2018 %P 318-350 %V 82 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM2_2018_82_2_a3/ %G en %F IM2_2018_82_2_a3