%0 Journal Article %A A. K. Gushchin %T $L_p$-estimates of the nontangential maximal function for solutions a second-order elliptic equation solutions %J Journal of Samara State Technical University, Ser. Physical and Mathematical Sciences %D 2013 %P 53-69 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/VSGTU_2013_1_a6/ %G ru %F VSGTU_2013_1_a6