%0 Journal Article %A M. F. Timan %T Estimation of the derivatives of the solution of a boundary value problem for a polyharmonic equation %J Differencialʹnye uravneniâ %D 1969 %P 574-579 %V 5 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1969_5_3_a20/ %G ru %F DE_1969_5_3_a20