%0 Journal Article %A V. A. Iskovskikh %T On Shokurov's Work \textit {Prelimiting Flips} %J Informatics and Automation %D 2003 %P 21-42 %V 240 %I mathdoc %U http://geodesic.mathdoc.fr/item/TRSPY_2003_240_a2/ %G ru %F TRSPY_2003_240_a2