%0 Journal Article %A L. A. Onegov %T An extremal problem of approximation of integrals with fixed singularity in the class $W^rL_2$ %J Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki %D 1985 %P 1599-1613 %V 25 %N 11 %I mathdoc %U http://geodesic.mathdoc.fr/item/ZVMMF_1985_25_11_a2/ %G ru %F ZVMMF_1985_25_11_a2