%0 Journal Article %A B. V. Budaev %T How should we improve the ray-tracing method? %J Algebra i analiz %D 2010 %P 43-49 %V 22 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/AA_2010_22_6_a1/ %G ru %F AA_2010_22_6_a1