%0 Journal Article %A I. D. Avrech %T Estimates of derivatives with respect to the parameter of the resolvent of a second order differential operator %J Differencialʹnye uravneniâ %D 1978 %P 719-723 %V 14 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1978_14_4_a15/ %G ru %F DE_1978_14_4_a15