%0 Journal Article %A A. V. Likhachev %T Tomographic reconstruction of a region with a given density value %J Numerical methods and programming %D 2018 %P 516-521 %V 19 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/VMP_2018_19_4_a17/ %G ru %F VMP_2018_19_4_a17