%0 Journal Article %A G. G. Magaril-Il'yaev %A E. O. Sivkova %T Optimal recovery of semi-group operators from inaccurate data %J Eurasian mathematical journal %D 2019 %P 75-84 %V 10 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/EMJ_2019_10_4_a7/ %G en %F EMJ_2019_10_4_a7