%0 Journal Article %A V. A. Danilov %T On the behavior of the derivatives of a quasi-conformal mapping near curves of discontinuity of the characteristic %J Doklady Akademii Nauk %D 1976 %P 1049-1051 %V 231 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1976_231_5_a4/ %G ru %F DAN_1976_231_5_a4